Cognomen Gilligan (Gilligan 
) , worldwide, is a common family name. The cognomen Gilligan is habitual in Guernsey, where it is quite a common surname, Ireland, and Australia, where it is quite a rare surname. In absolute terms, it is commonest in the United States, the United Kingdom, and Ireland.
| VARIANT | COUNTRY |
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| Gilligan | United Kingdom, Australia, Ireland, United States, Canada |
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barney gilligan Major League Baseball player, US (b. 1856) |
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edward augustine gilligan American clergyman, US (b. 1873) |
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| edward l. gilligan Medal of Honor recipient, US (b. 1843) |
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arthur gilligan English cricketer (1894-1976), GB (b. 1894) |
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harold gilligan English cricketer (1896-1978), GB (b. 1896) |
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julie gilligan American politician in Massachusetts (born 1911), US (b. 1911) |
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john j. gilligan American politician, governor of Ohio (1921–2013), US (b. 1921) |
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| sandy gilligan Scottish footballer (1872-1952), GB (b. 1872) |
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| tom gilligan Australian rules footballer b1874, AU (b. 1874) |
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| billy gilligan Scottish footballer (1876-1914), GB (b. 1876) |
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| geoffrey goyer gilligan (1877-1933) (b. 1877) |
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| arthur gilligan New Zealand Australian-rules footballer (1879-1963), NZ (b. 1879) |
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| sam gilligan Scottish footballer and manager (1882-?), GB (b. 1882) |
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| john gilligan Scottish footballer (1884-1946), GB (b. 1884) |
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| jack gilligan American baseball player, US (b. 1885) |
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