Surname O'Mahony (O'Mahony 
) , all around the world, is quite a common family name. The surname O'Mahony is characteristic of Ireland, where it is quite a common surname, Marshall Islands, and Bosnia and Herzegovina, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Ireland, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
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| O'Mahony | Australia, France, Ireland, United Kingdom, United States |
| connor o'mahony Irish Jesuit and political controversialist (b. 1594) |
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| conor o'mahony (b. 1594) |
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| daniel o'mahony Irish Jacobite army officer in French and Spanish service, FR (b. 1650) |
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| mary anne o'mahony (1701-1751) (b. 1701) |
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| james joseph o'mahony (b. 1699) |
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| darby demetry o'mahony French military personnel, FR (b. 1718) |
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arsène o'mahony French essayist, FR (b. 1787) |
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| jean-françois o'mahony French soldier and officer, FR (b. 1772) |
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timothy joseph o'mahony Irish writer 1839-1917, IE (b. 1839) |
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| thomas timothy o'mahony (b. 1825) |
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| cornelius o'mahony IE (b. 1840) |
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| john o'mahony (b. 1844) |
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danno o'mahony Irish professional wrestler, IE (b. 1912) |
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| seán o'mahony Irish politician, IE (b. 1864) |
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bertrand o'mahony French military personnel (1921-2007), FR (b. 1921) |
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