Cognomen Grain (Grainne 
, Gren 
, Grain ) , all around the world, is a common family name. The last name Grain is characteristic of Israel, where it is quite a common surname, Sweden, and Denmark, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Israel, Sweden, and France. Likewise, Grain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Grainne | Australia, Germany, United Kingdom, United States, Ireland |
| Gren | Morocco, France, Sweden, Israel, Poland |
| Grain | Morocco, France, Israel, Sweden, United States |
| เม็ด | Thailand |
| johann jeremias du grain German composer, PL (b. 1700) |
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peter grain American artist (1785-1857), US (b. 1785) |
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richard corney grain British entertainer, GB (b. 1844) |
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peter grain Chief Judge of the British Supreme Court for China (b. 1864) |
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| ed grain American football player, US (b. 1922) |
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| john grain (b. 1922) |
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| mona grain Swedish singer and revue artist (1941-2019), SE (b. 1941) |
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| michel grain French bicycle racer, FR (b. 1942) |
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jérémy grain French association football player, FR (b. 1994) |
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| georges grain French field hockey player, FR (b. 1948) |
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| david grain American businessperson, founder & CEO, Grain Management, LLC (b. 1962) |
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| inês rocha do espirito santo grain Person identified in the Museu da Pessoa collection (200158) (b. 1968) |
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| aaron grain actor and composer (b. 1973) |
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| gina grain Olympic cyclist, CA (b. 1974) |
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| frederick grain American painter, US |
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