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- Oliveira (5431)
- O'gorman (5414)
- Ormerod (5346)
- Osei (5215)
- Olsen (5109)
- O'dwyer (5064)
- Odedra (4908)
- Osbourne (4875)
- Ojo (4810)
- Oldroyd (4651)
- O'halloran (4602)
- O'dell (4530)
- O'mahony (4452)
- O'loughlin (4411)
- Oconnor (4295)
- Osmond (4235)
- O'shaughnessy (4168)
- O'boyle (4163)
- O'regan (4063)
- Odell (3995)
- Openshaw (3761)
- Old (3732)
- Ong (3558)
- Olley (3553)
- Oddy (3546)
- Oswald (3544)
- O'doherty (3407)
- Organ (3321)
- Onions (3304)
- Ogle (3196)
- Offord (3172)
- Olive (3153)
- Opoku (3152)
- O'dowd (3147)
- O'mahoney (3130)
- Oke (3129)
- O'riordan (3111)
- O'farrell (3056)
- O'meara (3014)
- Oliphant (2967)
- O'mara (2937)
- Ovenden (2912)
- Orrell (2908)
- Omer (2876)
- Orford (2814)
- Okafor (2703)
- Otter (2657)
- Odonnell (2599)
- O'flaherty (2523)
- Oakey (2517)
More people with the surnames beginning with O