Family name Macmahon (Macmahon 
, マクマホン, מקמהון 
) , in the entire world, is quite a rare last name. The surname Macmahon is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom, where it is a rare surname. In absolute terms, the name is most common in the United States, Ireland, and the United Kingdom.
| heber macmahon Irish bishop (b. 1600) |
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| hugh macmahon Roman Catholic Archbishop of Armagh, GB (b. 1660) |
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| bernard macmahon Catholic archbishop, GB (b. 1680) |
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| michael peter macmahon Irish bishop, IE (b. 1720) |
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| patrick macmahon Roman Catholic bishop (b. 1759) |
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| william macmahon judge (b. 1776) |
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percy alexander macmahon British mathematician (1854-1929), GB (b. 1854) |
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| charles macmahon Australian politician (1824-1891), GB (b. 1824) |
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| john henry macmahon Church of Ireland clergyman and classical scholar (b. 1829) |
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aline macmahon actress (1899-1991), US (b. 1899) |
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| michael macmahon Australian politician (b. 1854) |
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| philip john macmahon (1857-1911) horticulturist, author and public servant (b. 1857) |
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| james macmahon Australian theatre and cinema entrepreneur (1858-1915), AU (b. 1858) |
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| charles macmahon Australian film director (b. 1861) |
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| eleanor macmahon Irish romance novelist (1864-1956), IE (b. 1864) |
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