Around the globe, Ellefsen (Ellefsen 
) is an extremely rare unknown gender forename. Much more prevalently, Ellefsen is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Ellefsen | Norway, Canada, Iceland, United States, Denmark |
| christen frederik ellefsen Norwegian politician (b. 1812) |
|
|
| pauli ellefsen Prime Minister of the Faroe Islands (1936-2012), FO (b. 1936) |
|