Last name Hallahan (Hallahan 
) , in all the world, is quite a rare cognomen. The surname Hallahan is habitual in Ireland, where it is quite a rare surname, Australia, and the United States, where it is a rare surname.
| VARIANT | COUNTRY |
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| Hallahan | United Kingdom, Australia, Ireland, United States, Canada |
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margaret hallahan English Catholic religious sister, GB (b. 1803) |
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bill hallahan American baseball player (1902-1981), US (b. 1902) |
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tom hallahan Australian rules footballer, AU (b. 1908) |
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| jim hallahan, sr. Australian rules footballer, AU (b. 1878) |
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| walter rewi hallahan (1889-1918) soldier and metallurgist (b. 1889) |
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| jim hallahan, jr. Australian rules footballer (b. 1911) |
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maggie hallahan (b. 1961) |
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| william h. hallahan American novelist, US (b. 1925) |
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| kay hallahan Western Australian politician, AU (b. 1941) |
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mitch hallahan Australian footballer (b. 1992) |
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| charles hallahan American film, television and stage actor (1943-1997), US (b. 1943) |
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| mike hallahan Australian rules footballer (b. 1949) |
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| daniel p. hallahan (b. 1944) |
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| patrick hallahan American musician, US (b. 1978) |
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| william hallahan producer |
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