Surname Mcmains (Mcmains 
) , all over the world, is a rare cognomen. The surname Mcmains is habitual in the United States, where it is a rare surname, Canada, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Mcmains | Canada, United Kingdom, United States |
| chuck mcmains American politician, lawyer and businessman, US (b. 1948) |
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| juliet mcmains American dance historian (b. 1972) |
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| ron mcmains college basketball player (1965–1965) Indiana |
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| sara anne mcmains Ph.D. University of California, Berkeley 2000 |
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| cody mcmains American actor, US (b. 1985) |
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