Surname begins with
  1. a
  2. b
  3. c
  4. d
  5. e
  6. f
  7. g
  8. h
  9. i
  10. j
  11. k
  12. l
  13. m
  14. n
  15. o
  16. p
  17. q
  18. r
  19. s
  20. t
  21. u
  22. v
  23. w
  24. x
  25. y
  26. z
  1. O'Brien, Lucy
  2. O'Brien, Sean
  3. O'Byrne, Nicola
  4. O'Byrne, Nicola
  5. O'Connell, Joanne
  6. O'Connor, Bridget
  7. O'Connor, Deborah
  8. O'Connor, Elizabeth
  9. O'Donnell, Bridget
  10. O'Dowd, Chris
  11. O'Hara, Lauren
  12. O'Hara, Mo
  13. O'Hara, Natalia
  14. O'Hare, Gráinne
  15. O'Kane, Owen
  16. O'Neill, A.D.
  17. O'Neill, Amanda
  18. O'Neill, Heather Aimee
  19. O'Neill, Martin
  20. O'Reilly, Bill
  21. O'Rourke, P. J.
  22. O'Shaughnessy, Patrick
  23. O'Sullivan, Ronnie
  24. OBE, Doug Allan
  25. Oakley, Phil
  26. Oakley, Stu
  27. Oates, Joyce Carol
  28. Obasanjo, Olusegun
  29. Oborne, Martine
  30. Odette, Tessonja
  31. Odo
  32. Ogden, Emily
  33. Ogilvie, Sara
  34. Ojari, Daniel
  35. Olav Lahlum, Hans
  36. Oldfield, Matt & Tom
  37. Oldfield, Richard
  38. Oliver, Abi
  39. Oliver, Joshua
  40. Olivotti, Sergio
  41. Ollerton, Ollie
  42. Olley, Darcie
  43. Olsen, Chris
  44. Olson, Jessica S.
  45. Olson, Parmy
  46. Olusoga, David
  47. Olusoga, Kemi
  48. Olusoga, Yinka
  49. Ondaatje, Michael
  50. Orczy, Baroness
  51. Ord, Charlotte
  52. Orie, Rima
  53. Orlando, Jade
  54. Orsenna, Érik
  55. Ortega, Julio
  56. Orwell, George
  57. Osborne, George
  58. Oseid, Kelsey
  59. Osman, Jim
  60. Osmond, Richard
  61. Ostaseski, Frank
  62. Ounsley, Jodie
  63. Owen, Amanda
  64. Owen, Sid
  65. Owens, Lisa
  66. Oxlade, Chris
  67. Oyemakinde, Tomi
  68. Oyeyemi, Helen
  69. Ozawa, Eric
  70. O’Connor, Katherine Tiernan
  71. O’Hart, Sinéad
  72. O’Neill, Eamonn