Cognomen Gain (Gain 
, Gayn 
, เกน 
) , throughout the world, is a widespread surname. The family name Gain is characteristic of India, where it is quite a common surname, Bangladesh, where it is quite a rare surname, and Qatar. Measured by absolute frequency, it is the most numerous in India, Bangladesh, and France. Very seldom, Gain is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gain | Bangladesh, Philippines, France, United States, India |
| Gayn | Canada, Philippines, Iraq, United States, India |
| เกน | Thailand |
| Гаин | Kazakhstan, Russia |
| victor louis gain French politician, FR (b. 1799) |
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| louis victor gain FR (b. 1841) |
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| rené gain FR (b. 1856) |
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charles gain American police chief, US (b. 1923) |
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| joseph-armand-victor gain French military personnel (1878-1943), FR (b. 1878) |
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| gustave gain FR (b. 1876) |
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| rené gain 1889-07-24--1949-09-06 (b. 1889) |
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| louis gain FR (b. 1883) |
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| vasile gain Romanian association football player, RO (b. 1912) |
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| bob gain Player of American and Canadian football (1929-2016), US (b. 1929) |
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| benoît gain (b. 1941) |
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| annie gain FR (b. 1961) |
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| douglas gain South African cricketer, ZA (b. 1976) |
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| peter gain Irish footballer, IE (b. 1976) |
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| david bruce gain philologist |
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