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