200+ Outstanding Last Names That Start With O

Finding the perfect surname can be a challenge. We curated a massive list of last names starting with O to help you out. This collection features popular Irish clans, distinct Spanish titles, and unique monikers from around the globe.

Whether you are researching your family tree, writing a new story, or just curious about etymology, you will find plenty of inspiration here. Read on to discover the meanings and origins behind these outstanding names.

Exotic Last Names That Start With O

Travel the world with these distinct global surnames that start with O.

1. Oakry – An English surname describing someone who lives near an oak tree.
2. Ocampo – This Spanish name translates to “field,” specifically referring to Ocampo, Galicia.
3. Ocasio – A derivative of “ocaso,” which means “sunset” or “last phase” in Spanish.
4. Ochoa – A name of Basque origin that means “wolf,” often found in Spain and Mexico.
5. Odom – An English option that historically referred to a son-in-law or brother-in-law.
6. Oeth – A rare German surname with mysterious roots and an undetermined meaning.
7. Oetzel – A variation of Oz or Otzen, symbolizing “strength” and “courage” in Hebrew.
8. Offerman – An occupational Dutch name for the person guarding a church donation box.
9. Officer – This Scottish and English name refers to servants or officers of any capacity.
10. Offill – A topographical English name meaning “from the low village.”
11. Offutt – Derived from “off-ut,” an English phrase for land set apart from the main property.
12. Oganesyan – An Armenian surname derived from Ohanesian, connected to the biblical name John.
13. Ogilvie – A Gaelic topographical surname meaning “from Ogilvie” or “high plain.”
14. Ogilvy – A variation of Ogilvie, which is a popular clan name in Scotland and Ireland.
15. Ogle – This English name means “hill” and fits families who lived near rolling acres.
16. Ojeda – A Spanish habitational title for clans dwelling near leafy valleys or riverbanks.
17. Oka – A Japanese name meaning “hill” or “ridge,” often used as a prefix.
18. Okane – Derived from Ó Catháin, this Irish name means “battle” and was given to soldiers.
19. Okwilagwe – A distinctive Nigerian surname popular in its region of origin.
20. Olaeta – An occupational English title for ironworkers or those living in iron-fortified homes.
21. Olagbaju – A Nigerian name meaning “wealth” and “celebration,” traditionally given to rich families.
22. Olczak – A Polish name derived from Olcza, meaning someone who lives near the alder trees.
23. Oldenkamp – This Dutch name refers to families dwelling near old fields or pasture land.
24. Ole – A Danish and Norwegian name meaning “ancestor’s descendant.”
25. Olean – A habitational surname of English and Scottish origin meaning “from the city of Olean.”
26. Oles – This Greek name means “defender of men” and was originally given to elite servicemen.
27. Oleska – The Ukrainian variation of Aleksy, connected to Alexander and the defense of men.
28. Oley – A German occupational title for oil millers or merchants who sold oil.
29. Oliva – A name found in Spain, Italy, and Portugal meaning “olive tree,” a symbol of peace.
30. Olivares – A Spanish habitational name referring to families living near olive tree groves.
31. Olivarez – A variation of Olivares that translates to “olive groves” in Spanish.
32. Olivas – Derived from Olives, this was given to Spanish families who harvested or sold olive oil.
33. Olive – A French, Italian, and Spanish occupational name for a seller or extractor of olive oil.
34. Olivera – This Portuguese, Spanish, and Italian name means “olive tree” and doubles as a first name.
35. Olivo – A Spanish and Italian option referring to those dwelling near olive trees.
36. Olk – This German name means “property riches” and was associated with wealthy landowners.
37. Olle – A nickname for Olaf, which means “ancestor’s relic” in Norse.
38. Ollom – The German version of Ulm, meaning “flow,” which was inspired by river settlements.
39. Oloyede – A fierce Nigerian option that means “the chief has come.”
40. Oltz – Short for Olrich, meaning “rich” and “powerful,” fitting for families of leaders.
41. Olvera – A Spanish surname meaning “from Olvera,” pointing to prominent families from that region.
42. Olvey – A variation of Aldway, meaning “noble war” in English and German.
43. Omori – A Japanese name meaning “large grove,” given to those dwelling near large forests.
44. On – A short Chinese name meaning “peace” or “harmony,” depending on the character used.
45. Onder – A Turkish occupational title given to city leaders or famous business owners.
46. Ong – A common Chinese surname meaning “king” or “monarch.”
47. Ontiveros – A Spanish surname originating from a place name, possibly meaning “strong vine.”
48. Onwuka – An Igbo option that means “dignity is greater,” fitting for sophisticated clans.
49. Onyenwere – A rare Nigerian option often found in the Igbo language.
50. Ooman – Derived from “oom,” meaning “uncle” in Dutch and German dialects.
51. Opdahl – A Norse name meaning “up” and “valley,” often used for those living high up a valley.
52. Oppenheimer – A German habitational name meaning “from Oppenheim,” famously borne by physicist J. Robert Oppenheimer.
53. Opsal – A Norwegian name meaning “hall house farm,” indicating a specific type of farmstead.
54. Orji – A variation of Oji, which means “strong and mighty tree” in Igbo.
55. Oropeza – A Spanish name meaning “from Oropesa,” a town in Toledo, Spain.
56. Orozco – A Basque and Spanish name meaning “place of the holly trees.”
57. Orr – A Scottish and Irish name meaning “pale” or “green,” often found on coats of arms.
58. Ortega – A Spanish name meaning “nettle” or “grouse,” historically given to birdlike men.
59. Ortiz – A popular Spanish name meaning “son of Orti,” implying bravery and strength.
60. Osberg – A Scandinavian name meaning “river mouth” and “mountain.”
61. Oshea – An Anglicized form of the Irish Ó Séaghdha, meaning “fortunate” or “hawklike.”
62. Osorio – A Portuguese and Spanish name meaning “wolf hunter,” symbolizing bravery.
63. Oster – A Swedish and German surname given to families living in eastern settlements.
64. Otero – A Spanish topographical name meaning “height” or “hill.”
65. Oullette – Derived from “oulle,” meaning “small stream” in French, and prevalent in Canada.
66. Overbeck – A German topographical name meaning “from the other side of the stream.”
67. Oviedo – A Spanish habitational name for families dwelling near the city of Oviedo.
68. Ox – An English occupational surname for ox farmers or those selling oxen.
69. Oyvey – A German name meaning “wild boar,” initially given to men with fierce personalities.
70. Oz – A Hebrew name meaning “strength,” “heroism,” and “courage.”

Popular Last Names Starting With O

You likely know someone with one of these common O surnames.

1. Oakley – This British name means “meadow of oak trees” and is also a trendy first name.
2. Oaks – An English topographical name for someone dwelling near oak groves.
3. Oates – A German and English name meaning “wealth,” often associated with the pop duo Hall and Oates.
4. O’Bear – A derivative of Ó Béara, given to descendants of men named Bear or Beara.
5. O’Berry – A variation of Ó Béara, meaning “descendant of Béara” in Gaelic.
6. O’Boyle – An Irish name meaning “son of the rash one,” fitting for hot-tempered clans.
7. O’Brien – Derived from Ó Briain, meaning “high” and “noble,” and connected to the High King Brian Boru.
8. O’Cahan – A derivative of Ó Catháin, meaning “descendants of Cahan” in Irish.
9. O’Callaghan – Inspired by Ó Ceallacháin, which means “relatives of Ceallacháin” in Gaelic.
10. O’Casey – Derived from “cathasaigh,” meaning “vigilant” and “watchful” in Irish.
11. Ockenfeld – A German habitational title meaning “from Ockenfels.”
12. Ocker – A German name for someone dwelling near the Ocker River.
13. O’Clery – An Irish name inspired by O’Cleirigh, meaning “clerk” and “cleric.”
14. O’Connell – Derived from O’Conaill, meaning “strong as a wolf” in Gaelic.
15. O’Connor – An incredibly popular Irish name meaning “descendant of Conchobhar” or “hound of desire.”
16. Oddy – A derivative of Eadwig, meaning “war prosperity,” given to victorious soldiers.
17. Ode – An English name referring to a poem or lyric, ideal for families of wordsmiths.
18. Odell – An English name meaning “woad hill,” pointing to flowers used for blue dye.
19. Oden – A Norse and Scandinavian name meaning “frenzy,” associated with the god Odin.
20. Ogletree – An English and Scottish surname meaning “from the Ogle grove.”
21. Ogrady – Inspired by Ó Grádaigh, meaning “chief of the name” or “noble” in Irish.
22. Oh – A Korean name meaning “king” or “monarch,” and also a Japanese name meaning “great.”
23. O’Hagan – An Anglicized form of Ó hAodhagáin, meaning “little fire from the sun” in Irish.
24. O’Halloran – An Irish name meaning “stranger” or “from across the sea.”
25. O’Hara – Derived from Ó hEaghra, meaning “descendant of Eaghra” in Irish.
26. Olaf – A Norse name meaning “ancestor’s relic,” popular in Scandinavia.
27. Olah – A Hungarian name meaning “Romanian” or “Vlach.”
28. Oldaker – An English name traditionally given to those dwelling near old plowed fields.
29. Oldham – An English topographical name meaning “old lands.”
30. Oldroyd – An English name meaning “old clearing” or “old break in the forest.”
31. Oldt – A German name inspired by Alt, meaning “old,” ideal for mature families.
32. Olguin – A Spanish name meaning “to enjoy oneself” or “to be happy.”
33. Oliver – A name of Norse and French origin meaning “olive tree,” doubling as a classic first name.
34. Olivia – A Latin name meaning “olive tree,” symbolizing peace and unity among family.
35. Olmos – A name of Spanish origin meaning “elm tree,” symbolizing deep roots.
36. Olson – A Scandinavian patronymic name meaning “son of Olaf” or “son of Ole.”
37. Olverson – A derivative of Oliverson, given to Scottish relatives of Oliver.
38. Omar – An Arabic name meaning “flourishing” and Hebrew for “gifted speaker.”
39. Omdahl – A Norwegian name meaning “elm valley,” often a variation of Omdal.
40. Oneal – An Irish name meaning “champion” and “hero,” connected to Niall.
41. Onion – An English occupational surname for onion farmers or merchants.
42. Ono – A Japanese name meaning “small field,” famously borne by artist Yoko Ono.
43. Onorato – An Italian name meaning “honored,” initially given to revered men.
44. Onri – A Japanese name meaning “gratitude,” “favor,” and “kindness.”
45. Onsager – A Norwegian name meaning “cultivated field,” connected to the mythical god Odin.
46. Oog – A Dutch derivative of Auge, meaning “eye,” referring to someone with good vision.
47. Ooi – A Hokkien Chinese name, often a variant of Huang, meaning “yellow.”
48. Opal – A Sanskrit name meaning “precious gemstone,” referring to the iridescent stone.
49. Orbee – A British name meaning “Orri’s farmstead” or “Orri’s village.”
50. Orbit – An English name meaning “to encircle,” often associated with astronomy.
51. Ord – An English name meaning “point” or “spearhead,” referring to a triangular piece of land.
52. Ordaz – A derivative of Fortunio, meaning “lucky” and “fortunate” in Latin.
53. Orders – Derived from “hordere,” meaning “keeper of provisions” in English.
54. Ordonez – A Spanish patronymic name meaning “son of Fortunio” or “lucky.”
55. Ordoyne – A variation of Ordonez, implying wealth and luck.
56. Ore – An English name meaning “bank” or “shore,” or “from Woore.”
57. Orellana – A Spanish habitational name meaning “from Orellana.”
58. Orlando – An Italian name meaning “famous throughout the land,” also a city in Florida.
59. Ornelas – A Portuguese name derived from Dornelas, meaning “vat tub.”
60. Orosco – A sophisticated respelling of Orozco, meaning “place by the holly trees.”
61. Orourke – Derived from O’Ruairc, meaning “famous king” or “red king” in Irish.
62. Osborne – An English and Norse name meaning “god bear,” given to ferocious fighters.
63. Osburn – A variation of Osborne, a Norse title for men with bearlike qualities.
64. Osman – An English and Dutch name meaning “servant of God” or “god man.”
65. O’Sullivan – A very common Irish name meaning “descendant of the dark-eyed one.”
66. Osuna – A Spanish habitational name meaning “from Osuna” or “estate of Ursus.”
67. Oswald – An English and Scottish name meaning “divine power” or “ruler.”
68. Otis – A German name meaning “wealthy,” which also serves as a vintage first name.
69. Outlaw – An English name meaning “outside of the law,” historically given to rebels.
70. Owens – A Welsh name meaning “noble” or “well-born,” popular in the UK and US.

Unique Surnames Starting With O

Stand out from the crowd with these one-of-a-kind options.

1. Oakes – A nature-inspired name meaning “lives by the oak trees.”
2. Octavius – A Latin name meaning “eighth,” traditionally given to the eighth born child.
3. O’Day – An Anglicized form of Ó Deaghaidh, meaning “descendant of Deaghaidh.”
4. O’Dell – An English and Irish name meaning “from the dell” or “from Odell.”
5. O’Donovan – An Irish name meaning “descendant of Donndubhán” (brown-black).
6. Odorizzi – An Italian name meaning “wealth” and “prince,” related to Oderisio.
7. O’Driscoll – Derived from O hEidirisceoil, meaning “descendant of the messenger.”
8. Oe – A Japanese name meaning “large inlet” or “large bay.”
9. Oestreich – A German name meaning “Austria” or “eastern kingdom.”
10. O’Farrell – An Irish name meaning “descendant of Fearghal,” a man of valor.
11. O’Friel – An Irish name meaning “descendant of Friel.”
12. Ogden – An English habitational surname meaning “oak valley.”
13. Oghagbon – A Nigerian name with Benin roots, popular in West Africa.
14. Ogier – A French and English name meaning “wealthy spear.”
15. Oglesby – A Scottish and English name meaning “terrifying farmstead.”
16. Ohana – A Hebrew name meaning “son of Hannah” or Hawaiian for “family.”
17. Ohanesian – An Armenian patronymic surname for the “son of Ohan (John).”
18. Ohashi – A Japanese name meaning “large bridge,” symbolizing connection.
19. O’Hea – Derived from Aodh, the Irish version of Aiden, meaning “fire.”
20. Ohien – A distinctive Nigerian surname with strong cultural roots.
21. O’Higgins – An Irish name meaning “descendant of the Viking.”
22. Ohl – A German name meaning “meadowland surrounded by water.”
23. Ohland – A German name meaning “from the island” or “from Oland.”
24. Ohlsen – A unique respelling of Olson, meaning “son of Ohl.”
25. Ohm – A German name meaning “maternal uncle.”
26. Oiler – A German occupational surname for an oil merchant.
27. Oja – An Estonian and Finnish name meaning “stream,” “ditch,” or “brook.”
28. Ok – A Korean name meaning “jade” or Chinese for “happy.”
29. O’Keefe – An Irish name meaning “gentle,” “noble,” and “kind.”
30. Okeke – A Nigerian name meaning “man born on Eke day” (market day).
31. Olafson – An Icelandic patronymic name meaning “son of Olaf.”
32. Olde – An English name initially given to those with old souls or gray hair.
33. Olds – An English nickname turned surname, possibly for the eldest in a group.
34. Oleary – An Irish surname meaning “descendant of the keeper of calves.”
35. Oliveira – A Portuguese name meaning “from the olive tree.”
36. Olmstead – An English name meaning “from the elm place.”
37. O’Loughlin – An Irish name meaning “descendant of Lochlann” (Viking).
38. Olsen – A Danish and Norwegian name meaning “son of Ole.”
39. Olympia – A Greek name meaning “from Mount Olympus,” home of the gods.
40. Omalley – An Irish name meaning “descendant of the chief” or “noble.”
41. Omozee – A Nigerian name meaning “because of this child, I feel alive.”
42. Oneil – A variation of O’Neill, meaning “descendant of Neil.”
43. O’Neal – A common spelling of the Irish name O’Neill.
44. Oneill – The classic Irish spelling meaning “descendant of Niall” (champion).
45. Oramas – A Spanish habitational name meaning “from Oramas.”
46. Orefice – An Italian occupational surname for a goldsmith.
47. Oreilly – Derived from Ó Raghallaigh, meaning “descendant of Raghallach.”
48. O’Riordan – An Irish name meaning “royal poet,” perfect for writers.
49. Orris – An English name derived from Horace or a variation of Harris.
50. Orta – A Portuguese name meaning “garden,” fitting for green thumbs.
51. Osborn – A Norse name meaning “bear god.”
52. Osbourne – A variation of Osborn, famously borne by rocker Ozzy Osbourne.
53. O’Shaughnessy – An Irish name meaning “descendant of Seachnasach” (elusive).
54. Osterberg – A Swedish name meaning “eastern mountain.”
55. Ostrander – A name of likely Dutch or Swedish origin meaning “from the east border.”
56. Ostrich – A German surname meaning “eastern kingdom.”
57. Oswalde – An English name meaning “divine power.”
58. Otoole – A derivative of Ó Tuathail, meaning “descendant of the people’s ruler.”
59. O’Toole – The common spelling of the Irish clan name Ó Tuathail.
60. Ott – A German name derived from Otto, meaning “wealth.”
61. Otto – A German surname and first name meaning “prosperity.”
62. Outlow – A variation of Outlaw, meaning someone outside the law’s protection.
63. Outten – An English name meaning “from the outer village.”
64. Ovalle – A Spanish name meaning “valley,” often referring to a specific place.
65. Overstreet – An English topographical name for someone living “across the Roman road.”
66. Overton – An English habitational title meaning “upper settlement.”
67. Ovieda – A variation of the Spanish name Oviedo.
68. Owen – A Welsh surname meaning “well-born” or “noble.”
69. Oxendine – An English name meaning “valley of the oxen.”
70. Ozzy – A rare surname derived from Oswald or Osborn.

FAQs

What Is The Most Common Last Name Starting With O?

In the United States, Ortiz is the most common surname starting with the letter O, followed closely by Owens, Olson, and O’Connor. Globally, Asian surnames like Ong or Ou are also extremely prevalent.

What Does The “O” Mean In Irish Last Names?

The prefix “O” (originally Ó) in Irish surnames translates to “grandson of” or “descendant of.” For example, O’Brien means “descendant of Brian.” It signifies the clan’s ancestral lineage.

Are There Japanese Last Names That Start With O?

Yes, many Japanese surnames begin with O. Common examples include Ono (small field), Ota (large rice paddy), Ogawa (small river), and Okada (hill rice paddy).