All surnames beginning with O, sorted alphabetically (total individuals):
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1. O'Brien (146) 2. O'Callaghan (1) 3. O'Grady (1) 4. O'Neill (1) |
5. O'Reilly (1) 6. O'Sullivan (1) 7. O'Toole (2) 8. Ogden (10) |
9. Ogg (4) 10. Olmsted (21) 11. Oosthoek (1) 12. Oprey (4) |
13. Orndorff (2) 14. Orrill (1) 15. Osborne (4) 16. Osmond (1) |
17. Ostrom (1) 18. OVERLY (1) 19. Oxton (3) |