Cognomen Geoghegan (Geoghegan 
) , in the world, is quite a common family name. The last name Geoghegan is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom. Not in comparison with a country's population, this name is the most popular in Ireland, the United States, and the United Kingdom.
| james mac geoghegan Irish Roman Catholic priest and historian, IE (b. 1702) |
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| eugene geoghegan Roman Catholic bishop (b. 1706) |
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| richard geoghegan Irish agriculturist (b. 1717) |
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owney geoghegan American boxer, US (b. 1840) |
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| patrick geoghegan Australian bishop (1805-1864) (b. 1805) |
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richard h. geoghegan British Esperantist, GB (b. 1866) |
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| arthur gerald geoghegan (b. 1810) |
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| edward geoghegan (b. 1813) |
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| horatio geoghegan (b. 1821) |
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| j. d. geoghegan American politician, US (b. 1842) |
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john geoghegan American publisher, US (b. 1917) |
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| stannus geoghegan (b. 1866) |
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| james geoghegan Irish politician (1886-1951), IE (b. 1886) |
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leo geoghegan Australian racing driver (1936-2015), AU (b. 1936) |
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| walter david geoghegan (1892-1969) (b. 1892) |
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