Surname Blau (Blau 
, بلاو 
, בלאו 
) , in the entire world, is a common family name. The cognomen Blau is characteristic of Guam, where it is quite a common surname, Luxembourg, and Germany, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and Brazil. Very seldom, Blau is the forename as well as the last name.
| pierre blau cardinal, FR (b. 1350) |
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| andreas blau German entrepreneur, DE (b. 1500) |
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| felix anton blau German politician (1754-1798), DE (b. 1754) |
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| johann christoph blau (b. 1763) |
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| catharina elisabeth blau (b. 1764) |
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édouard blau French writer, FR (b. 1836) |
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tina blau-lang Austrian artist (1845-1916), AT (b. 1845) |
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| wilhelm leopold blau (b. 1791) |
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blau lajos Hungarian historian, HU (b. 1861) |
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| ludwig blau (b. 1808) |
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hermann blau German engineer, chemist, and inventor, DE (b. 1871) |
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josef blau German writer and educationist, DE (b. 1872) |
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| alfred blau French librettist (1827-1896), FR (b. 1827) |
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| otto blau German orientalist and diplomat (1828-1879), DE (b. 1828) |
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| friedrich blau (b. 1830) |
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