Family name Sethsen (Sethsen 
) , worldwide, is a very rare cognomen. The surname Sethsen is characteristic of Greenland, where it is quite a common surname, Sweden, where it is a rare surname, and Denmark, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sethsen | Greenland, Sweden, Denmark |
| seth sethsen danish-Greenlandic murderer (born 1955), DK (b. 1955) |
|