Apellido O'callaghan
Ranking por país y región
| País | Rank | Count |
| Ireland | 243 | 3.4k |
| Wales | 313 | <1k |
| Northern-ireland | 641 | <1k |
| Australia | 863 | 4.6k |
| England | 1117 | 5.1k |
| New-zealand | 1181 | <1k |
| South-korea | 4585 | <1k |
| Scotland | 7008 | <1k |
| Región | Rank | Count |
| Ireland, Munster | 66 | 2.8k |
| Wales, Blaenau-gwent-county-borough | 194 | <1k |
| Northern-ireland, Ulster | 338 | <1k |
| New-zealand, West-coast-region | 449 | <1k |
| Ireland, Connaught | 530 | <1k |
| Australia, Victoria | 576 | 2.2k |
| Ireland, Leinster | 657 | <1k |
| South-korea, Seoul | 752 | <1k |
| Scotland, Selkirkshire | 769 | <1k |
| Australia, Northern-territory | 798 | <1k |
| New-zealand, Otago-region | 896 | <1k |
| England, Merseyside | 952 | <1k |
| England, Warwickshire | 1294 | <1k |
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