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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. Oldham, Gavin
  51. Oliveira, Annette Amelia
  52. Oliver, Abi
  53. Oliver, Jana
  54. Olivotti, Sergio
  55. Olley, Darcie
  56. Olson, Parmy
  57. Olukoya, Dami
  58. Olusoga, David
  59. Olusoga, Kemi
  60. Olusoga, Yinka
  61. Onayemi, Prentice
  62. Ondaatje, Michael
  63. Ono, Yoko
  64. Onwukwe, Ben
  65. Orczy, Baroness
  66. Ord, Charlotte
  67. Orlando, Jade
  68. Orsini, Kate
  69. Ortega, Julio
  70. Orwell, George
  71. Osborne, George
  72. Osbourne, Jack
  73. Oseid, Kelsey
  74. Osman, Jim
  75. Osmond, Nicholas
  76. Osmond, Richard
  77. Osorio, Lee
  78. Ostaseski, Frank
  79. Ounsley, Jodie
  80. Ovens, Sarah
  81. Owen, Amanda
  82. Owen, Sid
  83. Owens, Lisa
  84. Owusu, Jude
  85. Oxlade, Chris
  86. Oyemakinde, Tomi
  87. Oyer, Paul
  88. Oyeyemi, Helen
  89. O’Connor, Katherine Tiernan
  90. O’Neill, Eamonn