Cognomen Karstens (Karstens 
, Карстенс 
) , all around the world, is quite a rare family name. The surname Karstens is characteristic of Germany, where it is quite a rare surname, Latvia, and Netherlands. Measured by absolute frequency, the name is most common in Germany, the United States, and Netherlands.
| VARIANT | COUNTRY |
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| Karstens | Netherlands, United States, Denmark, Germany, South Africa |
| Карстенс | Ukraine |
| johann daniel karstens (b. 1763) |
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harry karstens American government official, mountain climber and outdoorsman, US (b. 1878) |
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gerda karstens Danish ballet dancer (1903-1988), DK (b. 1903) |
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| maurycy karstens PL (b. 1857) |
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| heinrich karstens EE (b. 1874) |
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| johannes wilhelmus karstens Dutch photographer, NL (b. 1885) |
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| gustav karstens (b. 1877) |
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gerben karstens road bicycle racer, NL (b. 1942) |
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| heinrich karstens (b. 1895) |
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| willem karel hendrik karstens botanist (1908-1989), NL (b. 1908) |
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| max karstens (b. 1901) |
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| bob karstens American basketball player, US (b. 1915) |
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| george karstens football player (born 1924) (b. 1924) |
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jeff karstens American baseball player, US (b. 1982) |
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anke karstens German snowboarder, DE (b. 1985) |
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