Time is of the essence, especially when choosing the best boy names that start with O. If you enjoy a challenge, you’ll love this fun letter scheme. Guy names that start with O are often scattered, but we’ve gathered the best of the best in one place.
Whether you’re looking for vintage, cool, obsolete, or trendy O names for boys, we’ve got your back. You’ll walk away with an in-depth understanding of each name, including origins, meanings, and namesakes. The letter O has never looked cuter.
100 Top Male Names That Start with O
Keep reading to uncover the most distinguished names for boys that start with O.
Oak
Though tree names are cool, Oak is usually passed over in favor of Ash or Forrest. Oak deserves a second glance because it represents strength, justice, and honesty. This sweet title will remind Pokemon fans of Professor Oak, a main character in the series. Oak is unisex but likely to be used for boys.
- Origin: English
- Meaning: Meadow of oak trees
- Pronunciation: OHK
- Namesakes: Oak Onaodowan, an American Broadway star known for his role in Hamilton.
- Popularity: Oak is a unique title worldwide.
Oakland
Once a topographical title, Oakland described someone who lived near oak trees. Nowadays, Oakland is more likely to be associated with the beautiful California city. Many religions find deeper meaning in oak trees, giving Oakland a philosophical air. Oak trees remind us that great things begin in small packages, similar to your sweet newborn.
- Origin: English
- Meaning: Oak land
- Pronunciation: OHK-land
- Popularity: Oakland is a globally rare title that doesn’t appear on name charts.
Oakley
Oakley is among the trendiest boy names that start with O, showing no signs of slowing down. Doubling as a Southern surname, Oakley brings to mind the powerful Annie Oakley, a country marksman from the Wild West. There are plenty of boy namesakes, too, like Tyler Oakley, an American activist, and YouTuber. Call your little guy Oaks for short.
- Origin: English
- Meaning: Oak wood or clearing
- Pronunciation: OHK-lee
- Variations: Oaklee, Oakleigh
- Namesakes: Oakley Hall, an American writer specializing in novels.
- Popularity: In 2021, Oakley was the 401st most popular American boy’s name.
Oates
Oates is for the young man wealthy in all areas of life, material and not. Commonly used as a surname, Oates remains an obsolete first name. Parents with distinguished musical tastes will associate this title with Hall and Oates. Other notable namesakes include authors, models, athletes, and mathematicians.
- Origin: German
- Meaning: Wealth
- Pronunciation: OHTS
- Popularity: Oates is a popular surname but a rare first name.
Obadiah
Obadiah was a biblical prophet who bravely hid other prophets from the evil Queen Jezebel. Though Obadiah isn’t the most positive book of the Bible, many Christians are inspired by his courage. Obadiah is a common middle name but has never been among the top 1,000 American boy titles. Parents who like vintage O names for boys will flock to Obadiah.
- Origin: Hebrew
- Meaning: Servant of God
- Pronunciation: oh-bah-DYE-uh
- Variations: Obediah
- Namesakes: Obadiah Tarumbwa, a Zimbabwean football player.
Obafemi
Obafemi is a Nigerian spiritual name referring to God’s love for His children. Namesakes include Obafemi Awolowo, a Nigerian politician who achieved independence for his country. Obafemi could be an enticing pick for parents who hope their child will visit foreign lands. Sweet nicknames include Femi.
- Origin: Nigerian, Yoruban
- Meaning: The King loves me
- Pronunciation: oh-buh-FEH-mee
- Namesakes: Obafemi Martins, a Nigerian football player.
- Popularity: Obafemi is well-known in Africa but rare in the United States.
Obama
Obama inspires visions of pomp and circumstance as this is the title of a former U.S. President. Although Obama is commonly considered an African name, it actually has Japanese roots. If you desire five-letter boy names with O, add Obama to your list. May your little Obama be just as flexible as his name suggests.
- Origin: African, Japanese
- Meaning: Bending, little beach
- Pronunciation: oh-BAH-muh
- Namesakes: Barack Obama, America’s 44th President.
Obasi
Obasi is undoubtedly one of the most unusual guy names that start with O. Sometimes seen as a surname, Obasi has no notable namesakes. Obasi may appeal to parents who want their child to make his name in the world. With this clever title, your little angel is sure to make a splash.
- Origin: Igbo
- Meaning: Honor of God
- Pronunciation: oh-BAH-see
- Popularity: Obasi is a globally unique title.
Obed
In the Bible, Obed is the grandfather of King David, making him part of Christ’s family tree. Obed is a rare gem, perfect for parents desiring unusual spiritual titles. Referring to a man on God’s mission, Obed could be an excellent option for the future philanthropist. Who knows what fantastic things your little do-gooder will accomplish?
- Origin: Hebrew
- Meaning: Servant of God
- Pronunciation: OH-bed
- Namesakes: Obed Asamoah, the former Attorney General in Ghana.
- Popularity: Obed is a unique name worldwide, not appearing on any name charts.
Oberon
Shakespeare made Oberon a household name by casting him as the king of fairies in A Midsummer Night’s Dream. Before that, writers used Oberon in German mythology. Alternate meanings include “bearlike,” giving Oberon a fierce feel. Oberon is unisex, making it an intriguing nonbinary option.
- Origin: English, German
- Meaning: Noble
- Pronunciation: OH-ber-ahn
- Popularity: Oberon is a unique title that doesn’t appear on name charts.
Obert
Obert will be a top pick if you value a vintage aesthetic. With French and German roots, Obert is decidedly European. Obert’s straightforward pronunciation and charismatic interpretation make it a winning choice for any little star. You can call your little boy Bert for short.
- Origin: German, French
- Meaning: Wealthy, bright
- Pronunciation: OH-burt
Obi
Star Wars fans will associate Obi with Obi-Wan Kenobi, the infamous Jedi master. Obi means “heart,” symbolizing love, affection, and life. Other famous namesakes include an animé character, though many famous athletes have Obi as their surname. What an excellent pick for the boy you love with all your heart.
- Origin: African
- Meaning: Heart
- Pronunciation: OH-bee
- Variations: Obie
- Namesakes: Obi Ezeh, an American football player.
- Popularity: Obi is a popular African surname but a rare forename.
Ocean
Nature names are trendy, with Ocean making waves for American boys and girls. Many people say their favorite places are the seaside, giving Ocean positive connotations. For centuries, oceans have symbolized power, organized chaos, and peace. Ocean is unisex but is slightly more common for chaotic little boys.
- Origin: Greek
- Meaning: Sea
- Pronunciation: OH-shin
- Namesakes: Ocean Ramsey, an American environmentalist and model.
- Popularity: In 2021, Ocean was the 711th most popular American boy’s name.
Oceanus
In ancient history, Oceanus described a body of water surrounding the earth. Oceanus was also a prominent figure in Greek mythology, the result of heaven meeting earth. This Titan is one of the oldest, giving Oceanus a timeless feel. Oceanus could be an excellent option for a boy born near the sea.
- Origin: Greek
- Meaning: Of the ocean
- Pronunciation: OH-see-AN-us
- Popularity: Oceanus is a globally unique title that doesn’t appear on name charts.
Octave
Octave will be widely recognized among musicians, especially those who can hit impressive notes. Some may say Octave is a name for authors, with many French writers claiming this title as their own. Octave could be an intriguing option for parents who wish to pass on their love of the arts. Don’t be surprised when your little man comes out singing.
- Origin: French
- Meaning: Musical notes
- Pronunciation: AHK-tiv
- Namesakes: Octave Pradels, a French poet.
- Popularity: Octave is a globally unique name.
Octavius
Octavius was traditionally used for the eighth son, but you can always choose it for an August baby. Infamous Roman ruler Caesar Augustus’s original title was Octavius, giving it deep historical roots. Though Octavius was a character in the Hunger Games movies, it remains a 90s relic. Who knows what obstacles your little ruler will conquer?
- Origin: Latin
- Meaning: Eighth
- Pronunciation: ahk-TAY-vee-us
- Namesakes: Octavius Ellis, an American basketball player.
- Popularity: Octavius fell off American name charts in 1991.
Ode
Oh, the sonnets you could write about your sweet Ode! This literary title describes a poem dedicated to a particular person. Many poems have been crafted with Ode, so your little man will always have reading material. Perhaps irony will win, and your favorite Ode will be the world’s next great writer.
- Origin: English
- Meaning: A lyric poem
- Pronunciation: OHD
- Popularity: Ode is a unique name worldwide.
Odie
Odie may be rare today, but it was all the rage in the early 1900s. This moniker turned first name is an attractive choice for those who keep it short and sweet. Comic book fans will instantly associate Odie with Garfield’s lovable friend. Ashley Williams from How I Met Your Mother brought Odie into the spotlight by choosing it for her son in 2017.
- Origin: English, German
- Meaning: Of the valley, wealthy
- Pronunciation: OH-dee
- Namesakes: Odie Payne, an American Chicago blues drummer.
- Popularity: Odie fell off American name charts in 1931.
Odin
Norse mythology says one-eyed Odin exchanged his other eye for wisdom. The father of Thor, this character is one of mythology’s most famous rulers. The English form of Odin is “Woden,” which inspired Wednesday. Odin may be a great choice for a boy who appears midweek.
- Origin: Norse, Scandinavian, English
- Meaning: God of frenzy
- Pronunciation: OH-dihn
- Popularity: In 2021, Odin was among the top 400 American boy names.
Odolf
Odolf is for the cunning young man with a head for business. Though its meaning may seem snarky, wolves symbolize loyalty, family, and adaptability. Alternate meanings include “passionately dedicated,” an admirable trait for any young pup. With a name like Odolf, your little man will always know he’s one of the pack.
- Origin: German
- Meaning: Prosperous wolf
- Pronunciation: OH-dalf
- Variations: Adolf
Odysseus
In Greek mythology, Odysseus is known for his brilliance and ability to escape intense situations. He was the subject of Homer’s poem, The Odyssey, giving this name a literary slant. Despite its amazing history, Odysseus remains within the pages of a book. Odysseus has big shoes to fill, but we’re confident your little man is the guy for the job.
- Origin: Greek
- Meaning: Wrathful
- Pronunciation: oh-DISS-ee-uhs
- Namesakes: Odysseus Elytis, a Greek poet and Nobel Prize winner.
- Popularity: Odysseus remains a unique name worldwide.
Oedipus
Oedipus is among the most unassuming male names that start with O. Upon hearing it, you wouldn’t believe it falls under this category as the O is silent. Interesting namesakes include King Oedipus from Greek mythology. Call your boy Ed for short if you don’t like answering many questions.
- Origin: Greek
- Meaning: Swollen foot
- Pronunciation: ED-ih-puhs
- Popularity: Oedipus is a globally unique name that doesn’t appear on any name charts.
Ofir
Ofir was a biblical location known for being prosperous in gold and jewels. With its alluring interpretation, it’s no surprise this title is all the rage in Israel. Choose a simple spelling or fancy variation; the choice is yours. There’s no better name for your greatest treasure.
- Origin: Hebrew
- Meaning: Gold
- Pronunciation: oh-FEER
- Variations: Ophir
- Namesakes: Ofir Netzer, an Israeli gymnast.
- Popularity: Ofir is a popular name in Israel but rare in the United States.
Ogden
Ogden had a brief moment in 1907, then disappeared into oblivion. Old souls will be delighted by this small glimpse into the past. Ernest Cline saw the beauty in Ogden by crafting a character by this title in Ready Player One. With its cool pop culture references, Ogden could enjoy its rally moment any day.
- Origin: English
- Meaning: From the oak valley
- Pronunciation: AHG-den
- Namesakes: Ogden Nash, an American poet
- Popularity: Ogden fell off American name charts in 1907.
Ohad
Ohad appears in the book of Genesis, in the Bible, as the third son of Simeon. Alternate meanings include “praising” and “confessing,” making Ohad ideal for the faith-filled tot. If you’re not religious, Ohad will always remind you to give your child positive affirmations. Either way, you have a unique title that will make people stop in their tracks.
- Origin: Hebrew
- Meaning: Loved one
- Pronunciation: oh-HAHD
- Namesakes: Ohad Benchetrit, a Canadian musician who has contributed to Feist’s albums.
- Popularity: Ohad is popular in Israel but rare in western culture.
Ohnjel
As the Greek variation of an angel, Ohnjel is ideal for the chubby-cheeked cherub. You already believe your baby is heaven-sent, so why not name him Ohnjel? Ohnjel keeps your little man trendy but still on theme with male names that start with O. This unique variation of a popular name deserves a top place on your list of possibilities.
- Origin: Greek
- Meaning: Messenger of God
- Pronunciation: AHN-jel
- Popularity: Ohnjel is a globally unique title.
Oisin
Oisin is a skillet poet and warrior with a powerful family tree in Irish mythology. The son of Fionn mac Cumhaill and Sadhbh, Oisin could shape-shift into a deer, just like his mother. On a deeper level, deer symbolize intuition and adaptability. Oisin could be a fabulous way to honor Irish heritage or a love for the outdoors.
- Origin: Irish
- Meaning: Little deer
- Pronunciation: oh-SHEEN, UH-sheen
- Popularity: Oisin is popular in Ireland but rare in the United States.
Ojas
Ojas is the perfect option for the boy who comes out kicking and screaming. A traditional Indian name describing a healthy boy, Ojas is all you could hope for your newborn. With its tranquil pronunciation, we suspect Ojas will be a hit. Alternate meanings include “grandeur” and “strong one.”
- Origin: Indian, Sanskrit
- Meaning: Vitality
- Pronunciation: OH-jiss
Okeke
In the Igbo culture, Okeke refers to one born on Eke day. Eke day is one of four market days, known as celebratory occasions. Eke can also refer to a specific time of year, equivalent to April and May. Okeke could be an attractive choice for the Spring chicken.
- Origin: African
- Meaning: Born on Eke
- Pronunciation: oh-KAY-kay
- Popularity: Okeke is a rare name that doesn’t appear on name charts.
Olaf
Olaf is commonly associated with Disney’s lovable snowman from Frozen. Unlike Aurora, Olaf is a Disney title that never took off. The prince of your heart will shine with this royal title shared by multiple kings. Alternate meanings include “family,” perfect for the boy who completes your tribe.
- Origin: Norse
- Meaning: Ancestral heritage
- Pronunciation: OH-lahf
- Namesakes: Olaf Stapledon, a British philosopher and author.
- Popularity: Olaf fell off American name charts in 1921.
Olamide
Olamide is an authentic Yoruba title describing the baby who is the center of his parent’s world. Though Olamide is technically unisex, it’s more popular for boys. Sports introduced Americans to Olamide through Falcon’s football player Olamide Zaccheaus. Give your newborn a hippie nickname by calling him Day for short.
- Origin: African
- Meaning: My wealth has arrived
- Pronunciation: oh-la-MEE-day
- Namesakes: Olamide David, a Nigerian child actor known for his role in Cobweb.
- Popularity: Olamide is popular in Africa but rare in the United States.
Olatunde
It’s sunshine and roses with Olatunde by your side. This exotic title doesn’t have many namesakes, but the world is waiting for a star like your little guy. Olatunde is an alluring pick for the sweet guy who brings happiness to your heart. His ability to make others smile may be your favorite thing about him.
- Origin: African
- Meaning: Joy returns
- Pronunciation: oh-la-TOON-day
- Popularity: Olatunde is a globally unique title.
Olav
An edgier variation of Olaf, Olav, was traditionally used when referring to Norwegian royalty. Olav consistently ranks in the top 100 boy names in Finland and Norway but is rare in the U.S. This unique title is a great pick for parents who hope their little man takes after a favorite relative.
- Origin: Scandinavian, Norse
- Meaning: Ancestor’s relic
- Pronunciation: OH-lahv
- Namesakes: Olav V, the former King of Norway.
Olavi
If you’re looking for posh O names for boys, Olavi is your guy. The adorable Finnish variant of Olaf, Olavi, will appeal to parents who want to keep it casual. Olavi is famous in Finland, with many actors, athletes, and scientists sharing this name. Shorten Olavi by calling your little sprout Vee.
- Origin: Scandinavian, Finnish
- Meaning: Family descendant
- Pronunciation: oh-LAH-vee
- Namesakes: Olavi Svanberg, a Finnish ski champion.
- Popularity: Olavi is popular in Finland but rare in the United States.
Ole
Three-letter names are few and far between, so jump on Ole while you can. Alternate meanings include “rich heritage,” perfect for the boy with a strong family. Ole is rare in America but was one of Germany’s top 50 boys’ names in 2015.
- Origin: Danish, Norse, German
- Meaning: Ancestor’s heir
- Pronunciation: OHL
- Namesakes: Ole Romer, a Danish astronomer known for his accomplishments regarding the speed of light.
- Popularity: Ole fell off American name charts in 1915.
Oleg
The masculine equivalent to Olga, Oleg is rarely seen outside Europe. Alternate meanings include “blessed,” expressing a parent’s wish for their child to have a good life. Notable namesakes include Oleg Khvostov, a Russian spy, and Oleg Shatov, a Russian football player.
- Origin: Russian
- Meaning: Holy
- Pronunciation: OH-leg
- Namesakes: Oleg Cassini, an American fashion designer specializing in dresses.
- Popularity: Oleg is popular in Russia but rare in the U.S.
Oleksander
Oleksander is the Ukrainian variation of Alexander. Alexander the Great made these variations famous, particularly in Europe. Alternate spellings of this title are abundant, with many countries wanting a piece of the pie. Oleksander fits the boy who always stands up for what’s right.
- Origin: Greek, Ukrainian
- Meaning: Defender of mankind
- Pronunciation: OH-lehk-SAN-der
- Variations: Aleksander, Oleksandr, Alexander
- Popularity: Oleksander is a unique name worldwide.
Oleksiy
If you crave cute O names for boys, Oleksiy will be a top pick. A tamer version of Alexander, Oleksiy is in a class all on its own. With various alternate spellings, OIeksiy will appeal to parents who value individuality. Break gender norms by nicknaming your little warrior Leksi.
- Origin: Ukrainian, Greek
- Meaning: Defender
- Pronunciation: OH-lehk-see
- Variations: Oleksii, Oleksey
- Namesakes: Oleksiy Gai, a Ukrainian football player.
- Popularity: Oleksiy is popular in Ukraine but rare in the United States.
Olin
Olin is likelier to be seen as a last name, especially since the 1960s are long gone. Once used to describe an heir, Olin will make you look forward to what’s ahead. Though pop culture references are scarce, The Music Man features a character named Olin. You’ve inherited heaven’s blessings with the birth of your sweet jewel.
- Origin: Swedish, Scandinavian
- Meaning: To inherit, ancestor’s heir
- Pronunciation: OH-lihn
- Namesakes: Olin Kreutz, an American football player who played for the Bears.
- Popularity: Olin fell off U.S. name charts in 1964.
Olindo
Olindo is an ancient title in Torquato Tasso’s poem, Jerusalem Delivered. The character was well-known for his bravery in taking the fall for his lover, even when it meant death. Thankfully, fate interceded, but readers will never forget Olindo’s courage. Who knows what brave feats your sweetie will accomplish?
- Origin: Greek, Latin
- Meaning: Wild fig
- Pronunciation: OH-lihn-DOH
- Popularity: Olindo is a globally unique title that doesn’t appear on name charts.
Oliver
Oliver is proof that sometimes, vintage is best. First peaking in 1900, Oliver disappeared into the background, then jumped back to the top in 1991. Oliver has many pop culture references, including the bestselling novel Oliver Twist. Nicknames include Ollie, who also happens to be the lead singer of the punk band Bring Me the Horizon.
- Origin: French, German, Latin
- Meaning: Olive tree, ancestor’s descendants
- Pronunciation: AH-lih-ver
- Variations: Olivier
- Namesakes: Oliver Hardy, an American actor and comedian known for his role in Laurel and Hardy, a popular act.
- Popularity: Oliver ranked as the 3rd most popular American boy’s name from 2019-2021.
Olle
The simplified version of Aleifr, Olle, is a European delicacy. Olle fondly refers to one’s descendant, fitting for the boy who carries on the family name. Intriguing namesakes include Olle Hellbom, a Swedish director known for his work on the Pippi Longstocking movies.
- Origin: Swedish, Scandinavian, Norse
- Meaning: Relic, descendant
- Pronunciation: OH-lee
- Namesakes: Olle Romo, a Swedish music producer who worked with Shania Twain.
- Popularity: Olle is popular in Sweden and the Netherlands but rare in the United States.
Olorun
In the Yoruba religion, Olorun is the chief ruler of the heavens. Though Olorun is a boy’s name, the actual deity is gender-neutral. Alternate meanings include “heavens,” giving your boy an ethereal air. Bring this title down to earth by calling your little guy Roni.
- Origin: African
- Meaning: Belonging to the God Olorun
- Pronunciation: oh-loh-ROHN
- Variations: Oloron, Oloroon
Olson
Olson is a common surname but a rare forename. Many choose this title to honor their family lineage, while others adore being one of a kind. With a multitude of spellings, you can go either way. Surnames are slowly becoming trendy first names; who’s to say Olson isn’t next?
- Origin: Scandinavian
- Meaning: Son of Olaf
- Pronunciation: OHL-suhn
- Variations: Oleson, Olsen, Olsson
Oluwatosin
Oluwatosin may be one of the longest boy names with O. Long titles appeal to many, as they’re sophisticated. Oluwatosin could be a fabulous way to honor your faith and remind your little one what matters. Traditional nicknames include Tosin.
- Origin: Nigerian
- Meaning: God is worthy of worship
- Pronunciation: oh-LOO-wah-TOW-sihn
- Popularity: Oluwatosin is a globally unique title.
Olympus
Olympus is the highest mountain in Greece, where 12 mythological gods dwell. Marvel brought Olympus into the spotlight when they created a planetoid by this name. World War II fans will recognize Olympus as a famed Navy battleship. From now on, you’ll only see Olympus as your perfect little angel.
- Origin: Greek
- Meaning: Mount Olympus
- Pronunciation: UH-lihm-puhs
- Variations: Olympos
- Popularity: Olympus is a globally unique title that doesn’t appear on name charts.
Olyn
Olyn is a fabulous option for parents who want a nature name that’s not obvious. Olyn represents holly, a beautiful tree that symbolizes fertility. Holly is traditionally a Christmas decoration, making Olyn an excellent pick for a Christmas baby.
- Origin: Swedish, British
- Meaning: Holly
- Pronunciation: AH-linn, OH-linn
- Popularity: Olyn is a rare name worldwide.
Om
Sanskrit religion holds Om in high regard, as it’s a spiritual sound used in many Indian recitations. Om is also recited during meditations, reminding hearers to embrace peace. Spiritual titles are popular, especially among parents who love hippie vibes. Your sweet Om will always remind you to be mindful of the positive.
- Origin: Indian
- Meaning: Creation
- Pronunciation: OHM
Omar
Omar is listed in the Bible as a descendant of Esau. Omar is a popular name in Islamic culture, but it makes appearances in Spanish-speaking countries and the U.S. Your little Omar is bound to be a globe-trotter, and his name will help him blend in anywhere he goes. Omar is the perfect title for the little boy who succeeds at everything he tries.
- Origin: Arabic, Hebrew
- Meaning: Long-live, flourishing
- Pronunciation: oh-MAHR
- Namesakes: Omar Sharif, an Egyptian actor known for his role in Doctor Zhivago.
- Popularity: In 2021, Omar was among the top 300 American boy names.
Omega
Omega is the last letter of the Greek alphabet, where its meaning comes from. Christians will view Omega spiritually, as Jesus is described as the alpha and omega. Omega is unisex, but it may be more acceptable for boys. Omega could be an exciting title for your last child.
- Origin: Greek
- Meaning: Last
- Pronunciation: oh-MEG-ah
- Popularity: Omega is a globally unique title.
Omiros
The Greek variation of Homer, Omiros is forever associated with beautiful literature. Homer is a popular title, but Omiros is a story waiting to be told. Alternate meanings include “hostage,” making Omiros multifaceted. What a perfect pick for the boy you pledge to love forever.
- Origin: Greek
- Meaning: Pledge
- Pronunciation: OH-mee-rohs
- Popularity: Omiros is well-known in Greece but rare in America.
Omondi
Omondi is habitually given to African boys born before sunrise. Omondi is also perfect for your boy if you find yourself in this boat. You won’t see many people with Omondi as a forename, but plenty claim it as their last name. A few standout namesakes include Eric Omondi, a Kenyan football player, and Ted Omandi, a Kenyan rugby star.
- Origin: Luo, African
- Meaning: Born early in the morning
- Pronunciation: oh-MAHN-dee
- Popularity: Omandi is popular in Africa but rare in western culture.
Omri
In the Bible, Omri was a great king of Israel known for bringing peace to his country. Notable pop culture references include the main character from The Indian in the Cupboard. Omri is popular in Israel but rare in western culture. Your little guy could be the one to harvest the benefits of the obsolete.
- Origin: Hebrew
- Meaning: Sheaf of grain
- Pronunciation: AHM-ree, OHM-ree
- Namesakes: Omri Katz, an American actor known for his role in Hocus Pocus.
Ondre
Ondre was once used to describe Greek warriors, who were known for their intense, Spartan ways. While you may not want your little man to be so militant, a little discipline never hurts anyone. Alternate meanings include “manly,” making Ondre a hip pick for the macho man. Nicknames include Dre.
- Origin: Greek
- Meaning: Warrior
- Pronunciation: AHN-dray
- Variations: Andre
- Popularity: Ondre is a globally unique title.
Oneal
Oneal was all the rage during the 1930s but fell into oblivion by 1945. Parents with Neil in their lineage will jump at the chance to honor a family member with a creative twist. Alternate meanings include “champion,” referring to a boy who comes from a long line of winners. No matter what, Oneal will always be a winner in your eyes.
- Origin: Irish
- Meaning: From the chief’s line
- Pronunciation: oh-NEEL
- Variations: O’neal
- Popularity: Oneal fell off American name charts in 1945.
Onesimo
Onesimo was traditionally given to the firstborn Spanish sons, making it a cool choice for your oldest. There are disagreements on where this title originated; some say it has Spanish roots, and others say it’s African. The African interpretation of Onesimo is “useful” or “good behavior,” both honorable attributes. Shorten this long name by calling your boy Simo.
- Origin: Spanish, African
- Meaning: Firstborn son
- Pronunciation: OH-nee-see-MOH
- Namesakes: Onesimo Sanchez, a Spanish soccer player.
- Popularity: Onesimo is popular in Spanish-speaking countries but rare in the U.S.
Onfroi
Onfroi is a high-fashion variation of Humphrey. Parents will adore its meaning of “peaceful warrior.” Onfroi is a constant reminder that you can find peace amid chaos. With its French pronunciation, Onfroi brings refinement wherever he goes.
- Origin: French, German
- Meaning: Peaceful warrior
- Pronunciation: oon-FWAH
Onni
Onni consistently makes Finland’s top 10 name list but is a stranger to Americans. Cheery names are always a fun pick, bringing joy even on life’s rainy days. Alternate meanings include “luck,” making Onni your good luck charm. With its adorable moniker appearance, Onni is sure to bring joy to hearers.
- Origin: Finnish
- Meaning: Happiness
- Pronunciation: AH-nee
- Namesakes: Onni Tommila, a Finnish actor known for his role in Big Game.
- Popularity: Onni is popular in Europe but rare elsewhere.
Onofre
Onofre is for the man on a mission. One of the most notable namesakes is San Onofre, a 4th-century hermit remembered as a saint. There is also a beach named San Onofre in sunny California. Your little Onofre may be the next great philanthropist.
- Origin: Italian, Spanish, Portuguese
- Meaning: Defender of peace
- Pronunciation: uh-NOH-fray
- Namesakes: Onofre Marimon, an Argentine race car driver.
Onslow
One of the rarest 6-letter O names for boys, Onslow is primed for takeoff. With Arabic and English roots, this title spans the globe. Pop culture references are rare, but Keeping Up Appearances has a fun character named Onslow. Your little man’s zealous nature may be what makes him stand out.
- Origin: English, Arabic
- Meaning: From the zealous one’s hill
- Pronunciation: OHN-sloh
- Namesakes: Onslow Stevens, an American actor known for his role in House of Dracula.
- Popularity: Onslow is a unique title worldwide.
Onyx
Onyx is the birthstone for December and the birthstone for the Zodiac sign of Leo. Onyx could be a fabulous option for the boy born in December, July, or August if you’re into new-age rituals. Onyx was once a valuable currency that many believed scared off bad energy. No name is more fitting for your little badass with positive vibes.
- Origin: Greek
- Meaning: Claw
- Pronunciation: AH-niks, OH-niks
- Variations: Onix
- Namesakes: Onyx Lorenzoni, a Brazilian politician and member of Brazil’s Chief Staff.
- Popularity: In 2021, Onyx was among the top 500 American boy names.
Opie
Opie is short but meaningful, describing someone with good character. Though Opie is a vintage British title, we see pop culture references in Family Guy and Sons of Anarchy. Opie may be especially attractive if you live in the Southern part of America, where similar names are cool. Your little boy is just the guy to show the world how outstanding Opie can be.
- Origin: Cornish, Celtic
- Meaning: One who is like God
- Pronunciation: oh-PEE
- Variations: Oppy
- Namesakes: Opie Coates, an American clarinet player, turned radio actor.
- Popularity: Opie is a globally unique name.
Oral
As you can guess, Oral refers to words or someone who speaks publicly. Oral may be unique now, but from 1900-1929, it was consistently in the top 1,000 American boy names. Oral may be an attractive choice for parent’s hoping their boy excels in politics or another career where speaking is key. Alternate meanings include “golden son,” describing your boy to a tee.
- Origin: Latin
- Meaning: Speaker
- Pronunciation: OR-uhl
- Variations: Orel
- Namesakes: Oral Roberts, an American evangelist.
- Popularity: Oral fell off U.S. name charts in 1929.
Oran
Those familiar with saints will quickly connect Oran to Oran of Iona, an Irish saint. Aside from Irish roots, Oran is well-known among Scottish and Hebrew people. Alternate meanings include “little green man,” making Oran your adorable leprechaun. Oran could be an ironic option for the little man born near St. Patrick’s Day.
- Origin: Hebrew, Irish, Scottish
- Meaning: Light, song
- Pronunciation: OR-uhn, or-AHN
- Variations: Odhran
- Namesakes: Oran “Juice” Jones, an American R&B singer.
- Popularity: Oran fell off American name charts in 1949.
Orazio
Orazio is an appropriate option for the boy who is your answer to prayer. Your little man will have no shortage of Italian namesakes, including architects, actors, and writers. Alternate meanings include a “person who is steadfast in prayers,” making this a great choice for the future priest. Stay on trend by nicknaming your cherub Zee or Razi.
- Origin: Italian
- Meaning: Prayer
- Pronunciation: or-AH-zee-oh
- Namesakes: Orazio Rancati, an Italian football player who competed in the 1960 Summer Olympics.
- Popularity: Orazio is popular in Italy but rare in America.
Oren
Oren describes a strong little sapling with a bright future. In Native American culture, pine trees symbolize wisdom and intuition. Alternate meanings include “pale” and “fair,” making Oren a good option for the little blondie. Call your little seed Ren for short.
- Origin: Hebrew, Irish
- Meaning: Like a pine tree
- Pronunciation: OR-ehn
- Namesakes: Oren Williams, an American actor known for his role in The Amanda Show.
- Popularity: Oren fell off U.S. name charts in 1975.
Orestes
Orestes is widely known as an avenger in Greek mythology. Fueled by anger about his father’s murder, Orestes got revenge but was eventually driven insane. Though Orestes had an untimely end, his loyalty to his family makes him stand out. Alternate meanings include “one who conquers mountains,” giving your son a Titan air.
- Origin: Greek
- Meaning: He who stands on a mountain
- Pronunciation: or-ESS-tees
- Variations: Orestis
- Namesakes: Orestes Destrade, an American baseball player.
- Popularity: Orestes is a globally unique name.
Ori
Ori is a biblical term describing God as light. Christians will love this title, as there are many scriptures about being a light in the world. Ori is unisex but more commonly used for little boys. With a title like Ori, your little man can’t help but shine wherever he goes.
- Origin: Hebrew
- Meaning: My light
- Pronunciation: or-EE
- Namesakes: Ori Biton, an Israeli football player.
- Popularity: Ori is a globally unique title.
Oriel
Oriel is for the sweet newborn as good as gold. Classified as unisex, its similarities to Ariel make Oriel likelier to be used for girls. Oriel is a rare title, but it does appear in the book Malache Elyon. Don’t be surprised when your sweet Oriel is everyone’s golden boy.
- Origin: Latin
- Meaning: Golden
- Pronunciation: OR-ee-el
Origen
Similar to Origin, Origen will have people dreaming about their roots. In history, Origen of Alexandria was a theologian known as one of the greatest geniuses of Christianity. Sadly many of his writings were considered lies, so he didn’t reach Church Father status. Alternate meanings include “highborn,” referring to the boy with a fancy pedigree.
- Origin: Greek
- Meaning: Born
- Pronunciation: OR-ih-jen
- Popularity: Origen is a globally unique name that doesn’t appear on name charts.
Orion
Orion is a mythical giant with good looks and savvy hunting skills. If you study astronomy, you’ve likely seen Orion’s belt. Pop culture references include characters in Harry Potter and Men in Black. Orion has been one of America’s top 500 boy names since 2010, showing no signs of slowing down.
- Origin: Greek
- Meaning: Dawning
- Pronunciation: oh-RYE-uhn
- Namesakes: Orion Acaba, an American voice actor known for his role in video games like Call of Duty.
- Popularity: In 2021, Orion was in the top 400 American boy names.
Orlando
Jet-setters will instantly associate Orlando with the beautiful city in Florida. Shakespeare took a liking to Orlando, claiming the title for a character in his play As You Like It. Since then, there have been many namesake actors, athletes, writers, and singers. Orlando will remain famous throughout the land with its timeless history and strong appearance.
- Origin: Italian, Spanish
- Meaning: Famous throughout the land
- Pronunciation: or-LAN-doh
- Namesakes: Orlando Bloom, a British actor known for his role in Pirates of the Caribbean.
- Popularity: Orlando peaked in 1975 but remained among America’s top 1,000 boy names.
Ormond
Ormond was once used to describe a royal title, such as the Earl of Ormond. To this day, you can find Ormond Hill in Scotland, where Ormond Castle used to lie. The Irish meaning is “red,” making Ormond a cunning option for a red-haired boy. Ormond is rare, as you’re likelier to see it as a surname.
- Origin: Irish, English, Gaelic
- Meaning: Mountain of bears
- Pronunciation: OR-muhnd
- Popularity: Ormond is a popular surname but a rare forename.
Ornet
Ornet is an ultrarare variation of Arnett. If you prefer off-the-chart guy names that start with O, Ornet will make the final cut. Ornet means “little eagle,” America’s native bird. Eagles symbolize independence, beauty, and grace, traits any parent hopes their boy will have.
- Origin: French, English
- Meaning: Little eagle
- Pronunciation: OR-net
Orpheus
In Greek mythology, Orpheus was a musician who could play any instrument. Anytime he sang or played, his audience would fall in love with him, making Orpheus the best in the show. With a moody meaning, Orpheus could be an excellent pick for the boy born in the night. Who knows what talents your little Orpheus will possess?
- Origin: Greek
- Meaning: The darkness of the night
- Pronunciation: OR-fee-uhs
- Namesakes: Orpheus Pledger, an Australian actor known for his role in Silversun.
Orrel
Those who love America will flock to this Orrel, which refers to the national bird, the eagle. Orrel is a rare title that usually appears as a surname. Alternate meanings include “golden,” making it an exciting choice for the apple of your eye. With its vintage flair, Orrel is a rare gem waiting for the perfect boy to make it shine.
- Origin: Russian, Slavic
- Meaning: Eagle
- Pronunciation: OR-ruhl
- Popularity: Orrel is a rare name worldwide.
Orry
Forenames that sound like monikers are trendy; even with that in mind, Orry remains far and few. One notable namesake is Orry Main from the novel and television show North and South. In this series, Orry is portrayed as a loyal, helpful soldier, giving the name positive associations. Your tiny newborn is a taste of heavenly peace.
- Origin: Manx, Gaelic
- Meaning: God’s peace
- Pronunciation: OR-ee
Orson
Orson will bring to mind Hollywood lights, old movies, and shelves of awards. Orson Welles is a notable namesake known for the panic-inducing radio adaptation of The War of the Worlds. Orson may have gotten its meaning from the story of a little boy carried off by a bear to be raised in the den. Like a vintage teddy bear, your little Orson will never lack affection.
- Origin: Latin, English, French
- Meaning: Bear cub
- Pronunciation: OR-suhn
- Variations: Orsen
- Namesakes: Orson Scott Card, an American writer known for his science-fiction novels.
- Popularity: Orson fell off American name charts in 1901.
Ortiz
Ortiz is among authentic Spanish names for boys that start with O. There is no shortage of famous people with the last name Ortiz. Among them are Jorge Ortiz, a Spanish football player, and Opie Ortiz, an American tattoo artist. This diversity means your little man will always have a role model.
- Origin: Spanish
- Meaning: Son of Orti
- Pronunciation: or-TEEZ
- Popularity: Ortiz is a popular surname but a rare first name.
Orville
Orville’s likely association will be the fond memories that come with a bowl of Orville Redenbacher popcorn. There’s no denying that Orville is a popular name for brilliant minds. Other famous Orvilles include Orville Wright, an American aviator. By naming your little man Orville, you’re sure to strike gold.
- Origin: French
- Meaning: Gold town
- Pronunciation: OR-vihl
- Variations: Orvill, Orvil
- Namesakes: Orville Gibson, the American founder of Gibson Guitars.
- Popularity: Orville fell off American name charts in 1975.
Osbert
Osbert has been the regal title of British rulers and members of Parliament. Though obsolete, Osbert’s honorable namesakes make it a candidate for revival. With a name that describes his utter brilliance, your little Osbert is equipped to make the world a better place. You can call him Bert for short.
- Origin: English
- Meaning: God bright, divinely brilliant
- Pronunciation: AHZ-bert
- Variations: Osburt
- Namesakes: Osbert Lancaster, a British cartoon artist, author, and historian.
- Popularity: Osbert is well-known in Britain but rare in the United States.
Osborne
Osborne is a popular surname that would make a dashing stand-alone title. Common nicknames include Ozzy, which may inspire visions of erratic rock stars. Alternate meanings include “divine bear,” symbolizing strength and health. Peaking in 1910, Osborne has remained obsolete since 1915.
- Origin: English, Norse
- Meaning: Divine warrior
- Pronunciation: AHZ-born
- Variations: Osbourne, Osborn
- Namesakes: Osborne Smith, an American baseball player.
- Popularity: Osborne fell off American name charts in 1915.
Oscar
Celebrities are obsessed with the 5-letter Oscar, potentially due to the famous award. Gordon Ramsay, Robin Tunney, and Hugh Jackman are just a few stars choosing Oscar for their sweet boys. Irish mythology paints Oscar as a famous warrior, giving this title a fierce air. Alternate meanings include “deer-lover,” perfect for the future environmentalist.
- Origin: Irish, Scandinavian
- Meaning: God’s spear, champion warrior
- Pronunciation: AHS-ker
- Namesakes: Oscar de la Hoya, an American boxer.
- Popularity: Oscar peaked in the early 1900s but remained among the top 300 American boy names.
Osgood
Osgood is the ideal option for your little creative genius. Parents hoping their child will excel in the arts will be overjoyed with Osgood. Alternate meanings include “Goth God,” which refers to a style of art. Your little Osgood will be unstoppable with a paintbrush in his hand and you by his side.
- Origin: English, Teutonic
- Meaning: Divine creator
- Pronunciation: AHZ-good
- Variations: Osgod
- Namesakes: Osgood Perkins, an American actor known for his role in Legally Blonde.
- Popularity: Osgood is a globally unique title.
Oshea
Oshea is an alluring opportunity for parents who want to combine their Irish heritage with spirituality. A variant of Joshua, Oshea is also an Irish surname when spelled “O’shea.” Alternate meanings include “fine” and “fortunate,” making Oshea incredibly optimistic. This multifaceted title has just as many layers as your sweet little boy.
- Origin: Hebrew, Irish
- Meaning: Yahweh is salvation
- Pronunciation: oh-SHAY
- Variations: O’shea
Osiris
Osiris recently picked up steam, but it’s always been a character in ancient Egyptian mythology. Osiris’s myth was so revered that it influenced how Egyptians saw rebirth and the afterlife. Osiris’s recent popularity may be due to pop culture references like a god in DC comics. Unique nicknames include Si.
- Origin: Egyptian
- Meaning: Powerful, mighty
- Pronunciation: oh-SYE-riss
- Namesakes: Osiris Eldridge, an American basketball player.
- Popularity: In 2021, Osiris ranked #948 among American boy names.
Osman
Once only common in Arabic countries, Osman is slowly making its way into American hearts. Though Osman is a surname, it’s likelier to be used as a first name. Your little prince will glow with this unique title many Sultans and politicians share. If Osman’s edgy meaning is too much, go with the alternate interpretation of “God’s protection.”
- Origin: Arabic, Scandinavian
- Meaning: Son of a snake
- Pronunciation: AHS-mahn, OHZ-men
- Namesakes: Osman Dikic, a Bosnian poet and writer.
- Popularity: In 2021, Osman made the top 1,000 American boy names.
Osric
You already know your little man will rule the roost, so why not name him Osric? This stately title is made for a future CEO with boss energy. Shakespeare must have thought the same because he quickly penned Osric into Hamlet. Keep it traditional by nicknaming your little king Ric.
- Origin: English
- Meaning: Divine ruler
- Pronunciation: AHS-rihk
- Variations: Osrick
- Namesakes: Osric Chau, a Canadian actor known for his role in Supernatural.
- Popularity: Osric is a globally unique title that doesn’t appear on name charts.
Ossie
Ossie may inspire visions of Australian scenery, but it couldn’t be more different. A moniker for titles like Oscar or Oswald, Ossie is hip enough to stand on its own. Ossie is unisex but is obsolete for boys and girls. If you want to resurrect an early American relic, choose Ossie for your divine boy.
- Origin: English
- Meaning: Divine power
- Pronunciation: AHS-ee
- Namesakes: Ossie Davis, an American actor known for his activism.
- Popularity: Ossie fell off American name charts in the early 1900s.
Ostin
An edgier variant of Austin, Ostin is one of the loftiest boy names that start with O. Parents who love traditional names with a twist will adore Ostin, especially with its strong meaning. Ostin is a story waiting to be told, with your magnificent boy front and center.
- Origin: French
- Meaning: Great, magnificent
- Pronunciation: OH-stihn
- Popularity: Ostin is a globally unique title.
Osvaldo
Closely related to Oswaldo, Osvaldo was famous in the early 2000s. The end of 2015 marked Osvaldo’s extinction, but vintage names make a comeback regularly. Christians will adore Osvaldo’s reference to “God’s power,” making it an excellent name for the miracle child. With multicultural origins, your little trendsetter will fit in wherever his bucket list takes him.
- Origin: Italian, Spanish, Portuguese
- Meaning: God’s power
- Pronunciation: AHS-val-doh
- Variations: Oswaldo
- Popularity: Osvaldo fell off American name charts in 2015.
Otello
If you want a simplified version of Othello, you’ll be keen on Otello. Opera fans will want to check out Otello, a beloved opera based on Shakespeare’s Othello. A fun Italian title, Otello is for the boy with a champagne taste. Nicknames include the adorable Tello.
- Origin: Italian
- Meaning: Wealth, fortune
- Pronunciation: oh-TEL-oh
- Variations: Othello
- Namesakes: Otello Toso, an Italian actor known for his role in Desert Desperadoes.
- Popularity: Otello is common in Italy but rare in the U.S.
Othmar
Othmar is perfect for the boy with impeccable poise. The most notable Othmar in history is Saint Othmar, a medieval priest. This holy man is often depicted holding a barrel, signifying that he always had enough to give. Your little Othmar’s generosity may make him go down in history.
- Origin: Arabic, Hebrew, German
- Meaning: Prosperity, eloquent
- Pronunciation: ATH-mar
- Variations: Ottmar, Otmar
- Namesakes: Othmar Schoeck, a Swiss classical composer.
Othniel
Othniel appears in the Bible as one of the first judges. In those times, judges moonlighted as rulers and military heroes. These responsibilities may be where Othniel gets its powerful interpretation, “Lion of God.” Lions symbolize beauty, strength, and loyalty, all great things to inspire your little cub.
- Origin: Hebrew
- Meaning: Lion of God, strength of God
- Pronunciation: ATH-nee-el, OTH-nee-el
- Namesakes: Othniel Looker, the 5th governor of Ohio.
Otis
90s kids will likely associate Otis with the beloved dog in Milo and Otis. Hollywood has a special place for Otis, with astounding namesakes in The Walking Dead and Chicago Fire. Celebrities like Tobey Maguire and Olivia Wilde struck gold when they chose Otis for their sons. Darling nicknames include Odie.
- Origin: German, English
- Meaning: Wealthy, son of Ode
- Pronunciation: OH-tiss
- Namesakes: Otis Rush, an American blues guitarist.
- Popularity: Otis peaked in the early 1900s but remained one of America’s top 700 boy names.
Overton
Overton was traditionally used as a topographical name describing someone who lived near a riverbank. You’d be hard-pressed to come across someone named Overton, but many claim it as a surname. American Football player Don Overton is the best-known namesake, playing for both the Patriots and Lions.
- Origin: English
- Meaning: From the riverbank town
- Pronunciation: OH-ver-tuhn
- Namesakes: Overton Vertis Wright, an American singer and blues artist.
- Popularity: Overton is a popular surname but a rare forename.
Ovie
Native to Nigeria, Ovie is among the most charming boy names with O. Ovie will appeal to parents who want their child to have an African title that blends in with western culture. Ovie had a boost in popularity after Ovie Soto competed on Love Island in 2019. Since then, it’s remained erratic but full of potential.
- Origin: Nigerian, Urhobo
- Meaning: King
- Pronunciation: oh-VEE
- Variations: Ovey
Owen
Owen has been topping American name charts since 1900 and shows no signs of giving up. Before Owen was a smashing forename, it was a Renaissance surname, sometimes spelled “Owens.” Among the most popular Owens is Owen Wilson, an American actor who starred in Cars. Owen is an enticing pick for the newfangled boy with a steadfast background.
- Origin: Welsh, Celtic
- Meaning: Young warrior
- Pronunciation: oh-WEHN
- Namesakes: Owen Wister, an American author who wrote The Virginian.
- Popularity: Owen has been among the top 50 American boy names since 2010.
Oxford
Oxford is best known as the gorgeous college town in England. Parents who met at this school or who simply love the area may choose this name to commemorate the famous county town. Because of its intellectual interpretation, Oxford is seen as a distinguished title. If Oxford is too mature, you can nickname your little student Ford.
- Origin: English
- Meaning: From the oxen crossing
- Pronunciation: AHKS-ford
- Popularity: Oxford is a globally unique title.
Ozias
Ozias is the son of the biblical Joram, sometimes called Uzziah. O names that include Z are seen as cutting edge, giving Ozias a trendy feel. Alternate meanings include “strength from the Lord,” an endearing sentiment of faith. May your little Ozias always find strength in his faith and family.
- Origin: Greek
- Meaning: Salvation
- Pronunciation: OH-zye-us
- Variations: Osias
- Namesakes: Ozias Leduc, a Canadian painter who specialized in still life.
O Names for Boys FAQs
What Are Rare Names for Boys That Start with O?
With O being such an obscure letter, many rare names for boys start with O. Foreign titles like Obafemi, Ofir, and Ohad are rarely seen in the United States. Vintage names like Odie, Octavius, Osvaldo, and Orville were once popular but are now extinct. Other choices include off-the-wall titles like Osric, Orrel, and Ornet.
What Is the Most Popular Baby Boy Name That Starts with O?
The most popular baby boy name that starts with O is Owen, an American classic since 1900. Owen has always stayed above the top 600 names, making it a timeless title with a bright future. Another popular option is Oliver, one of the top 10 American names since 2017. Oliver has always been top of the class, from Disney movies to classic literature.
