Surname Nassen (Nassen 
) , across the world, is a rare last name. The cognomen Nassen is habitual in Belgium, where it is quite a rare surname, Sweden, where it is a rare surname, and Germany. Measured by absolute frequency, it is the most numerous in Belgium, Germany, and the United States. Very seldom, Nassen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Nassen | Germany, Sweden, Belgium, South Africa, United States |
| josef nassen DE (b. 1861) |
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| josef nassen DE (b. 1877) |
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| pieter nassen Belgian bicycle racer, BE (b. 1944) |
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| daniël nassen Belgian association football player, BE (b. 1966) |
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| ulrich nassen |
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Mr, Kent, Kurt, Paul, Rolf, Rita, Dawn, Dirk, Greg, Lana, Lars, Leon, Leen, Lois, John, Joan, Jean, Tori, Nick, Eddy, Eric, Febe, Bill, Inge, Bart, Anja, Ms, An, Mac, Ann, Amy, Kim, Liz, Jan, Jos, Jim, Tom, Tim, Evi, Ulf, Udo, Uwe, Mark, Miet, Alex, Andy, Anna, Arno, and Ilse