Cognomen Mccullagh (Mccullagh 
) , in the entire world, is quite a rare surname. The cognomen Mccullagh is characteristic of Ireland, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Australia.
| VARIANT | COUNTRY |
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| Mccullagh | Australia, Canada, Ireland, United Kingdom, United States |
Macculloch, Mccollough, Mcculloch, and Mccullough
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john h. mccullagh American police officer, captain of the NYPD, US (b. 1842) |
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| james benjamin mccullagh Canadian missionary, CA (b. 1854) |
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george mccullagh Canadian newspaper publisher, CA (b. 1905) |
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| francis mccullagh Irish journalist and war correspondent (1874-1956) (b. 1874) |
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| declan mccullagh American journalist, US (b. 1901) |
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| edward mccullagh Northern Irish politician (b. 1912) |
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| sheila k. mccullagh English children's writer, GB (b. 1920) |
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| maxie mccullagh boxer (b. 1922) |
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| c. behan mccullagh historian (b. 1937) |
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| peter mccullagh Irish statistician, IE (b. 1952) |
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| suzanne folds mccullagh (b. 1951) |
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| connor mccullagh Irish athletics competitor, IE (b. 1961) |
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| shona mccullagh New Zealand choreographer, dancer and artistic director, NZ (b. 1962) |
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| diana mary mccullagh (born 1965) (b. 1965) |
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| andrew john mccullagh (born 1968), GB (b. 1968) |
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