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