Cognomen O'Mahoney (O'Mahoney 
) , across the world, is quite a rare surname. The cognomen O'Mahoney is characteristic of Northern Europe, particularly Guernsey, where it is quite a common surname, Ireland, where it is quite a rare surname, and the United Kingdom, where it is a rare surname. In absolute terms, this name is the most popular in the United Kingdom, Ireland, and Australia.
| VARIANT | COUNTRY |
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| O'Mahoney | Guernsey, United Kingdom, United States, Ireland, Australia |
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katharine a. o'keeffe o'mahoney Irish-American educator, lecturer, writer, US (b. 1852) |
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eugene o'mahoney Irish entomologist, IE (b. 1899) |
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tom o'mahoney Dutch golfer, NL (b. 1945) |
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| matt o'mahoney Irish footballer (1913-1992), GB (b. 1913) |
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| nora o'mahoney IE (b. 1912) |
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| jim o'mahoney football player (born 1941) (b. 1941) |
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| bernard o'mahoney British writer (b. 1960) |
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| lauren l o'mahoney researcher |
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| paul o'mahoney researcher |
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| thomas g o'mahoney researcher |
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| ivan o'mahoney director and filmmaker, RU |
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| dan o'mahoney British civil servant, former marine |
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| john f. o'mahoney Peerage person ID=561944 |
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| michelle o'mahoney |
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| john o'mahoney |
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