Surname Callaghan (Callaghan 
, Калаган 
, Калахан 
) , all around the world, is a common family name. The surname Callaghan is characteristic of Ireland, where it is quite a common surname, Fiji, and Australia (explore the name in all countries). Not in comparison with a country's population, the name is most common in the United Kingdom, the United States, and Ireland. Much less frequently, Callaghan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Callaghan | Australia, United Kingdom, United States, Canada, Ireland |
| Калаган | Ukraine, Kazakhstan |
| Калахан | Ukraine, Russia, Kazakhstan |
| Каллаган | Ukraine, Russia |
O'Callaghan, and Цаллагхан
| callaghan maccarty, 3rd earl of clancarty (died 1676) (b. 1645) |
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| daniel callaghan Irish politician (b. 1786) |
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| gerard callaghan United Kingdom Member of Parliament (b. 1787) |
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| abigail armory callaghan (b. 1784) |
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george callaghan Royal Navy admiral of the fleet, GB (b. 1852) |
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bryan callaghan, jr. US (b. 1852) |
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| thomas callaghan (1815-1863) judge, AU (b. 1815) |
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| jeremiah thomas fitzgerald callaghan British colonial governor (b. 1827) |
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| eliza callaghan GB (b. 1828) |
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cecil callaghan Australian Army officer, AU (b. 1890) |
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daniel judson callaghan United States Navy Admiral and Navy Medal of Honor recipient, US (b. 1890) |
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frank callaghan New Zealand teacher, agricultural instructor, scientific administrator (1891–1980), NZ (b. 1891) |
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patrick edmund callaghan politician in Massachusetts, US, US (b. 1895) |
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william m. callaghan United States Navy Admiral (1897-1991), US (b. 1897) |
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marty callaghan American baseball player (1900-1975), US (b. 1900) |
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