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  1. O'Brian, Terrie
  2. O'Brien, Gerry
  3. O'Brien, Sean
  4. O'Byrne, Nicola
  5. O'Byrne, Nicola
  6. O'Callaghan, Jonathan
  7. O'Connell, Joanne
  8. O'Connor, Bridget
  9. O'Connor, Des
  10. O'Connor, Elizabeth
  11. O'Donnell, Bridget
  12. O'Dowd, Chris
  13. O'Furniture, Patty
  14. O'Hara, Lauren
  15. O'Hara, Mo
  16. O'Hara, Natalia
  17. O'Hare, Gráinne
  18. O'Kane, Owen
  19. O'Malley, Rory
  20. O'Neill, Amanda
  21. O'Neill, Heather Aimee
  22. O'Neill, Martin
  23. O'Reilly, Bill
  24. O'Rourke, P. J.
  25. O'Shaughnessy, Patrick
  26. O'Sullivan, Feargus
  27. O'Sullivan, Heather
  28. O'Sullivan, Ronnie
  29. O'Sullivan, Suzanne
  30. O'Toole, Peter
  31. O'Yeah , Zac
  32. Oakley, Phil
  33. Oakley, Stu
  34. Obama, Michelle
  35. Obiora, Michael
  36. Oborne, Martine
  37. Ochlan, PJ
  38. Ochman, Joe
  39. Ochota, Mary-Ann
  40. Odo
  41. Ogilvie, Sara
  42. Ojari, Daniel
  43. Ojo, Adenrele
  44. Okello, Kate
  45. Okoye, Nneka
  46. Okuboyejo, Sandra
  47. Olav Lahlum, Hans
  48. Oldfield, Richard
  49. Oldham, Andrew
  50. Oliver, Abi
  51. Oliver, Jana
  52. Olivotti, Sergio
  53. Olley, Darcie
  54. Olson, Parmy
  55. Olukoya, Dami
  56. Olusoga, David
  57. Olusoga, Kemi
  58. Olusoga, Yinka
  59. Onayemi, Prentice
  60. Ondaatje, Michael
  61. Ono, Yoko
  62. Onwukwe, Ben
  63. Orczy, Baroness
  64. Ord, Charlotte
  65. Orlando, Jade
  66. Orsini, Kate
  67. Ortega, Julio
  68. Orwell, George
  69. Osborne, George
  70. Osbourne, Jack
  71. Oseid, Kelsey
  72. Osman, Jim
  73. Osmond, Nicholas
  74. Osmond, Richard
  75. Osorio, Lee
  76. Ostaseski, Frank
  77. Ounsley, Jodie
  78. Ovens, Sarah
  79. Owen, Amanda
  80. Owen, Sid
  81. Owens, Lisa
  82. Owusu, Jude
  83. Oxlade, Chris
  84. Oyemakinde, Tomi
  85. Oyer, Paul
  86. Oyeyemi, Helen
  87. Ozolins, Janis
  88. O’Connor, Katherine Tiernan
  89. O’Neill, Eamonn