Cognomen Mahaffy (Mahaffy 
) , around the globe, is quite a rare surname. The surname Mahaffy is characteristic of Canada, where it is a rare surname, the United States, and the United Kingdom.
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| Mahaffy | Australia, Austria, Canada, United States, United Kingdom |
| ninian mahaffy (1762-1825) (b. 1762) |
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john pentland mahaffy Irish classicist and polymathic scholar, CH (b. 1839) |
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| sarah addison brindley mahaffy (born 1797) (b. 1797) |
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| nathaniel brindley mahaffy (1798-1897) (b. 1798) |
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| george e. mahaffy American politician, US (b. 1847) |
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| arthur arnold mahaffy Canadian politician (1861-1947), CA (b. 1861) |
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john mahaffy Canadian ice hockey player (1918-2015), CA (b. 1918) |
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| robert pentland mahaffy born:1871|died:1943|; Mahaffy, Robert Pentland; Mahaffy, Robert P. (Robert Pentland), 1871-1943, GB (b. 1871) |
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| james mahaffy Canadian politician, CA (b. 1905) |
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| rupert mahaffy (1923-2005) (b. 1923) |
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| henrietta clare elisabeth mahaffy (born 1949) (b. 1949) |
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| sarah georgiana mahaffy (born 1952), GB (b. 1952) |
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| dominic john mahaffy (1955-1956) (b. 1955) |
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| kate alexandra mary mahaffy (born 1959) (b. 1959) |
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| susanna victoria mahaffy (born 1963) (b. 1963) |
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