Cognomen Mccusker (Mccusker 
) , throughout the world, is quite a common family name. The cognomen Mccusker is habitual in Ireland, where it is quite a rare surname, the United Kingdom, and Australia. Not in comparison with a country's population, the name is most common in the United States, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
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| Mccusker | Canada, United Kingdom, United States, Ireland, Australia |
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james l. mccusker American swimmer, US (b. 1869) |
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red mccusker Canadian ice hockey player, CA (b. 1895) |
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| arthur mccusker New Zealand photographer (1868-1943), NZ (b. 1868) |
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malcolm mccusker Australian barrister, philanthropist, and governor, AU (b. 1938) |
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| emmett mccusker Canadian politician, CA (b. 1889) |
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| declan mccusker performer (20th century) (b. 1901) |
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| neal mccusker (1907-1987) commissioner for railways (b. 1907) |
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| james mccusker (1913–1994) Australian entrepreneur and philanthropist, AU (b. 1913) |
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john mccusker Scottish folk musician, GB (b. 1973) |
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elaine mccusker American public servant, US |
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| alison mccusker Australian botanist (1933-2015), AU (b. 1933) |
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| bob mccusker Canadian ice hockey player, CA (b. 1935) |
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| jim mccusker American football player (1936-2015), US (b. 1936) |
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| john j. mccusker American academic, US (b. 1939) |
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| jim mccusker Northern Ireland footballer, GB (b. 1939) |
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