Surname Gainous (Gainous 
) , all over the world, is a rare last name. The cognomen Gainous is characteristic of the United States, where it is a rare surname, New Zealand, where it is a very rare surname, and Canada. Not in comparison with a country's population, it most frequently occurs in the United States, Canada, and Italy.
| fred gainous American academic administrator (b. 1947) |
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| gerald gainous White House intruder, US |
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| marquise gainous college basketball player (1999–2000) Texas Christian |
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| jason gainous (b. 1971) |
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