Family name Allertsen (Allertsen 
) , in the world, is a very rare cognomen. The surname Allertsen is habitual in Norway, where it is a rare surname, and Italy, where it is a very rare surname. Much less frequently, Allertsen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Allertsen | Italy, Norway |
| fredrik allertsen Norwegian association football player (b. 1991) |
|