Cognomen Dahm (Dahm 
, داهم 
, 达姆 
) , all around the world, is a common family name. The last name Dahm is habitual in Luxembourg, where it is quite a common surname, Germany, where it is quite a rare surname, and Norway. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Saudi Arabia. Much less frequently, Dahm is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Dahm | Poland, Brazil, Germany, United States, Saudi Arabia |
| داهم | Yemen, Algeria, Iraq, Iran, Saudi Arabia |
| 达姆 | China |
| Дам | Ukraine, Belarus, Russia, Kyrgyzstan, Kazakhstan |
| johann jakob dahm organ builder, DE (b. 1659) |
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| otto heinrich dahm DE (b. 1668) |
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| johann michael dahm DE (b. 1688) |
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| johanna von der dahm 27 Sep 1698 - 24 Aug 1734 Uckro (b. 1698) |
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| bernhard christian dahm Swedish painter (1718-1768), SE (b. 1718) |
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| niklas dahm (1750-1800) (b. 1750) |
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leonard dahm Swedish politician (1812-1883), SE (b. 1812) |
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| johann georg dahm DE (b. 1754) |
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| hans peter dahm Norwegian artist (1787-1844), DK (b. 1787) |
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| carl valentin dahm (b. 1777) |
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| wilhelm dahm DE (b. 1812) |
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| auguste sophie christiane dahm 14 Dec 1824 Stuttgart - 3 Sep 1884 Tübingen (b. 1824) |
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peter dahm German university teacher and pianist (1877-1947), DE (b. 1877) |
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helen dahm Swiss artist (1878-1968), CH (b. 1878) |
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| thalia dahm NO (b. 1828) |
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