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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, Eden
  22. O'Neill, Heather Aimee
  23. O'Neill, Lisa
  24. O'Neill, Martin
  25. O'Reilly, Bill
  26. O'Rourke, P. J.
  27. O'Shaughnessy, Patrick
  28. O'Sullivan, Feargus
  29. O'Sullivan, Heather
  30. O'Sullivan, Ronnie
  31. O'Sullivan, Suzanne
  32. O'Toole, Peter
  33. O'Yeah , Zac
  34. Oakley, Phil
  35. Oakley, Stu
  36. Obama, Michelle
  37. Obiora, Michael
  38. Oborne, Martine
  39. Ochlan, PJ
  40. Ochman, Joe
  41. Ochota, Mary-Ann
  42. Odo
  43. Ogden, Emily
  44. Ogilvie, Sara
  45. Ojari, Daniel
  46. Ojo, Adenrele
  47. Okello, Kate
  48. Okoye, Nneka
  49. Okuboyejo, Sandra
  50. Olav Lahlum, Hans
  51. Oldfield, Richard
  52. Oldham, Andrew
  53. Oldham, Gavin
  54. Oliveira, Annette Amelia
  55. Oliver, Abi
  56. Oliver, Jana
  57. Olivotti, Sergio
  58. Olley, Darcie
  59. Olson, Parmy
  60. Olukoya, Dami
  61. Olusoga, David
  62. Olusoga, Kemi
  63. Olusoga, Yinka
  64. Onayemi, Prentice
  65. Ondaatje, Michael
  66. Ono, Yoko
  67. Onwukwe, Ben
  68. Orczy, Baroness
  69. Ord, Charlotte
  70. Orlando, Jade
  71. Orsini, Kate
  72. Ortega, Deanna
  73. Ortega, Julio
  74. Ortiz, Vico
  75. Orwell, George
  76. Osborne, George
  77. Osbourne, Jack
  78. Oseid, Kelsey
  79. Osman, Jim
  80. Osmond, Nicholas
  81. Osmond, Richard
  82. Osorio, Lee
  83. Ostaseski, Frank
  84. Ounsley, Jodie
  85. Ovens, Sarah
  86. Owen, Amanda
  87. Owen, Sid
  88. Owens, Lisa
  89. Owusu, Jude
  90. Oxlade, Chris
  91. Oyemakinde, Tomi
  92. Oyer, Paul
  93. Oyeyemi, Helen
  94. O’Connor, Katherine Tiernan
  95. O’Neill, Eamonn