Cognomen Klementsen (Klementsen 
) , throughout the world, is a very rare last name. The surname Klementsen is habitual in Norway, where it is quite a rare surname, Denmark, where it is a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Klementsen | Norway, United States, Denmark |
Clemensen, Clementsen, Clementson, Clemmensen, Klemetsen, Klemetson, and Клемменсен
| rolf klementsen sport shooter, NO (b. 1913) |
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| marcus klementsen Faroese association football player (b. 1994) |
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| fridrikka klementsen |
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