Surname Dau (Dau 
, داو 
, Дау 
) , all around the world, is a common family name. The cognomen Dau is habitual in Fiji, where it is quite a common surname, Myanmar, where it is quite a rare surname, and Papua New Guinea. Measured by absolute frequency, it most frequently occurs in Myanmar, India, and Vietnam. Also, Dau is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Dau | Myanmar, India, Nigeria, Vietnam, Germany |
| داو | Iran, Egypt, Sudan |
| Дау | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| heinrich dau Danish geologist, DE (b. 1790) |
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| johann dau (b. 1816) |
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| gustav dau German politician and farmer (1853-1904), DE (b. 1853) |
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herbert wilhelm dau German politician (1911-2000), DE (b. 1911) |
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| w. h. t. dau (b. 1864) |
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carl dau jewelry designer, DE (b. 1942) |
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| rolf dau German navy officer and world war II U-boat commander, DE (b. 1906) |
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| carl dau (b. 1900) |
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ceryan dau French writer, FR (b. 1966) |
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| leda dau Brazilian botanist (1924-2011), BR (b. 1924) |
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| helmut dau German librarian, jurist and law librarian, DE (b. 1926) |
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| willy dau (b. 1918) |
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| hans dau Swedish politician, SE (b. 1932) |
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markus dau German handball player, DE (b. 1982) |
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| klaus dau German editor, DE (b. 1934) |
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