Surname Grein (Gren 
, Grain 
, Grein ) , in all the world, is a common family name. The surname Grein is characteristic of Israel, where it is quite a common surname, Sweden, and Luxembourg, where it is quite a rare surname. In absolute terms, it is the most numerous in Germany, Brazil, and Israel. Very seldom, Grein is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gren | Germany, Poland, Brazil, United States, Israel |
| Grain | Germany, Brazil, United States, Israel, France |
| Grein | Germany, Poland, Brazil, United States, France |
| Grayn | Spain, Morocco, Bulgaria, United States, Philippines |
| caspar arnold grein DE (b. 1746) |
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| caspar arnold grein DE (b. 1764) |
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| philipp ludwig grein DE (b. 1799) |
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| franz karl anton grein DE (b. 1800) |
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| jacob grein (b. 1800) |
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j. t. grein British impresario, GB (b. 1862) |
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| willem grein Dutch photographer (1829–1883), NL (b. 1829) |
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| christian wilhelm michael grein DE (b. 1825) |
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| dirk grein Dutch photographer, NL (b. 1866) |
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| ernst theodor emil grein DE (b. 1865) |
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| heinrich grein German politician, DE (b. 1882) |
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| alice grein (b. 1874) |
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| karl grein DE (b. 1881) |
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| józef grein (b. 1886) |
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| franz grein AT (b. 1900) |
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