Family name Fain (Fain 
, فاين 
, Фаин 
) , worldwide, is a common cognomen. The family name Fain is characteristic of the United States, where it is quite a rare surname, Croatia, and Belgium. Not in comparison with a country's population, this name is the most popular in the United States, Russia, and Argentina. Very seldom, Fain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Fain | France, Indonesia, India, United States, Argentina |
| فاين | Iraq, Egypt, Sudan, Yemen |
| Фаин | Belarus, Russia, Kyrgyzstan, Kazakhstan |
| Файн | Kazakhstan, Ukraine, Kyrgyzstan, Armenia, Russia |
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agathon jean françois fain French historian (1778-1837), FR (b. 1778) |
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| thomas fain (b. 1760) |
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| eliza rhea anderson fain (b. 1816) |
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| lucile fain French golfer (1867-1942), FR (b. 1867) |
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jordana fain Argentinian actress, AR (b. 1917) |
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| paul fain (b. 1861) |
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| sarah lee fain American school teacher and politician (1888-1962), US (b. 1888) |
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| gael fain (b. 1892) |
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| ben fain American contract bridge player, US (b. 1903) |
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| alexandre marie alphonse jean fain Belgian entomologist and acarologist (1912-2009), BE (b. 1912) |
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| yonia fain Ukrainian-born artist, poet and author, UA (b. 1913) |
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| matty fain US (b. 1905) |
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| michel fain French psychoanalyst, FR (b. 1917) |
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| harry fain American lawyer (1918-2007), US (b. 1918) |
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tim fain American violinist, US (b. 1979) |
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