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143 Last Names that Start with ‘O’

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Many last names that start with the letter O have an air of optimism and positivity. When spoken, the letter O gives a very open, inviting sound. Below, we list some of the most common last names that begin with O.

Why Choose a Last Name Beginning with O?

The letter O has a deep, booming tone. Many last names in the United States start with O’ (O followed by an apostrophe). The suffix of O’ originates in the Irish and Gaelic languages and means ‘grandson/descendant of.’ So, for example, the last name O’Connor means ‘grandson or descendant of Connor.’ Other surnames starting with O in the US include names with Scandinavian origins, such as Olson, and names with Hispanic roots, such as Ortiz. Popular last names in the US, starting with O, include Owens, Ortega, Oliver, Ochoa, and Osborne. Unique last names beginning with O include Oakes, Oakley, Olivier, Onyx, and Orleans.

Many exciting surnames start with O if you need help finding a creative last name for your family or fictional character.

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Last Names Starting with O

Uncover the top surnames starting with O with this complete list below. Here you will find a list of surnames that begin with OA, sorted by popularity, from most to least popular.

  1. Ortiz
  2. Owens
  3. Olson
  4. Ortega
  5. Oliver
  6. Ochoa
  7. Osborne
  8. Orozco
  9. Owen
  10. Olsen
  11. Oneill
  12. Oneal
  13. Orr
  14. Odom
  15. Osborn
  16. Odell
  17. Osorio
  18. Oneil
  19. Olvera
  20. Orellana
  21. Ott
  22. Ocampo
  23. Olivares
  24. Ornelas
  25. Otto
  26. Oleary
  27. Ojeda
  28. Otero
  29. Olivas
  30. Oliva
  31. Oliveira
  32. Ogden
  33. Overton
  34. Ordonez
  35. Oh
  36. Omalley
  37. Oakes
  38. Oakley
  39. Orourke
  40. Ontiveros
  41. Ogle
  42. Oswald
  43. Ouellette
  44. Oldham
  45. Orlando
  46. Overstreet
  47. Oglesby
  48. Oates
  49. Oreilly
  50. Otoole

  1. Olguin
  2. Oshea
  3. Olivo
  4. Osman
  5. Olmos
  6. Olivarez
  7. Ong
  8. Ostrander
  9. Ocasio
  10. Olivera
  11. Outlaw
  12. Orosco
  13. Oden
  14. Oviedo
  15. Olmstead
  16. Orta
  17. Ordaz
  18. Ovalle
  19. Olds
  20. Omar
  21. Osuna
  22. Osburn
  23. Otis
  24. Ogrady
  25. Oaks
  26. Oxendine
  27. Oropeza
  28. Oakry
  29. O’Bear
  30. O’Brien
  31. O’Connor
  32. Oestreich
  33. Oghagbon
  34. Ogier
  35. Okeke
  36. Okwilagwe
  37. Olaeta
  38. Olagbaju
  39. Olczak
  40. Oloyede
  41. Olverson
  42. Omdahl
  43. Omozee
  44. O’Neal
  45. O’Neill
  46. Onwuka
  47. Onyenwere
  48. Oramas
  49. Orji
  50. Orth

  1. Outlow
  2. Outten
  3. Overbeck
  4. O’Brien
  5. O’Connor
  6. O’Neill
  7. O’Sullivan
  8. O’Boyle
  9. O’Cahan
  10. O’Callaghan
  11. O’Casey
  12. O’Clery
  13. O’Connell
  14. Octavius
  15. O’Day
  16. O’Dea
  17. O’Dell
  18. O’Donovan
  19. O’Driscoll
  20. O’Farrell
  21. O’Friel
  22. Ogilvie
  23. Ogilvy
  24. O’Hagan
  25. O’Halloran
  26. O’Hara
  27. O’Hare
  28. O’Hea
  29. O’Higgins
  30. O’Keefe
  31. Olivier
  32. Ollivier
  33. O’Loughlin
  34. Olympia
  35. O’Lynn
  36. O’Reilly
  37. O’Riordan
  38. O’Shaughnessy
  39. O’Sheehan
  40. O’Sullivan
  41. O’Toole
  42. O’Donnell
  43. Ozzy

See 5,000 Most Common Last Names

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