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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. Ogden, Emily
  46. Ogilvie, Sara
  47. Oh, James Aaron
  48. Ohkle, Amanda
  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, Ben
  61. Oliver, Jana
  62. Olivotti, Sergio
  63. Olley, Darcie
  64. Olney, Peter
  65. Olson, Parmy
  66. Olufawo, Tumi
  67. Olukoya, Dami
  68. Olusoga, David
  69. Olusoga, Kemi
  70. Olusoga, Yinka
  71. Onayemi, Prentice
  72. Ondaatje, Michael
  73. Ono, Yoko
  74. Onwukwe, Ben
  75. Orczy, Baroness
  76. Ord, Charlotte
  77. Orlando, Jade
  78. Orsini, Kate
  79. Ortega, Deanna
  80. Ortega, Julio
  81. Ortiz, Vico
  82. Orwell, George
  83. Osborne, George
  84. Osbourne, Jack
  85. Oseid, Kelsey
  86. Osman, Jim
  87. Osmond, Nicholas
  88. Osmond, Richard
  89. Osorio, Lee
  90. Ostaseski, Frank
  91. Ounsley, Jodie
  92. Ovens, Sarah
  93. Owen, Amanda
  94. Owen, Sid
  95. Owens, Lisa
  96. Owusu, Jude
  97. Oxlade, Chris
  98. Oyemakinde, Tomi
  99. Oyer, Paul
  100. Oyeyemi, Helen
  101. Ozaki, Yei Theodora