Family name Callsen (Callsen 
) , around the world, is quite a rare last name. The cognomen Callsen is characteristic of Denmark, where it is quite a rare surname, Germany, and Norway, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Denmark.
| VARIANT | COUNTRY |
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| Callsen | Norway, Canada, Germany, United States, Denmark |
| peter callsen German navy officer and world war II U-boat commander, DE (b. 1911) |
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johannes callsen German politician, DE (b. 1966) |
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| kuno callsen DE (b. 1911) |
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| brigitta callsen (b. 1967) |
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| gordon callsen researcher |
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| lasse callsen |
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