Surname Mellemsether (Mellemsether 
) , in the entire world, is a very rare cognomen. The family name Mellemsether is habitual in Northern Europe, particularly Norway, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Mellemsether | Norway |
Mr, Beate, Trine, Hanna, Oskar, Ole-Kristian, and Bjørn-Erik