Surname Sheahan (시헌 
, Sheahan 
) , across the world, is quite a common cognomen. The cognomen Sheahan is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and New Zealand. Not in comparison with a country's population, this name is the most popular in the United States, Ireland, and Australia. Very seldom, Sheahan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| 시헌 | South Korea |
| Sheahan | Canada, Australia, United States, United Kingdom, Ireland |
| james washington sheahan (b. 1824) |
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marion winifred sheahan American nurse, US (b. 1892) |
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| fred sheahan Australian rules footballer, AU (b. 1870) |
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| gerald sheahan Australian rules footballer (1872-1959), AU (b. 1872) |
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| padraig sheahan Dublin Metropolitan Police Constable, IE (b. 1876) |
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john sheahan Traditional Irish musician, IE (b. 1939) |
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| bill sheahan New South Wales politician (1895-1975), AU (b. 1895) |
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| frank d. sheahan American politician (1901-1974), US (b. 1901) |
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| maurie sheahan Australian rules footballer (1905-1956), AU (b. 1905) |
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| pat sheahan New Zealand rugby union footballer and publican, NZ (b. 1927) |
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kate sheahan Australian rules footballer (b. 1982) |
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| john sheahan Australian rules footballer (b. 1942) |
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| paul sheahan Australian cricketer, AU (b. 1946) |
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| mike sheahan Australian rules football journalist, AU (b. 1947) |
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| terry sheahan Australian politician, AU (b. 1947) |
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