Last name Blach (Blach 
, Блак 
) , all over the world, is quite a rare cognomen. The family name Blach is characteristic of Denmark, where it is quite a rare surname, Austria, and Poland. Not in comparison with a country's population, the name is most common in Germany, Poland, and the United States. Also, Blach is the forename as well as the last name.
| oluf blach Danish merchant (1694-1767), DK (b. 1694) |
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| jørgen blach (b. 1796) |
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| ferdinand blach holocaust victim, b. 1884-10-12, CZ (b. 1884) |
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| svend blach field hockey player, DK (b. 1893) |
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| friedrich samuel blach (b. 1884) |
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| ejvind mollerup blach field hockey player (1895-1972), DK (b. 1895) |
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| arne blach Danish field hockey player (1900-1977) (b. 1900) |
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| erich blach German writer and lyricist (1907-1979), DE (b. 1907) |
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| preben blach field hockey player (1920-2007), DK (b. 1920) |
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| sofie blach prisoner in Theresienstadt Ghetto, b. 1923-12-28 (b. 1923) |
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| karl blach Austrian mountaineer, AT (b. 1929) |
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ty blach American baseball player, US (b. 1990) |
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| pedro v. blach badminton player, ES (b. 1949) |
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| daniel blach French rugby union player, FR (b. 1953) |
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| pascal blach FR (b. 1950) |
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