Surname Мортенсен (Mortensen 
, Мортенсен 
) , all around the world, is a common family name. The last name Мортенсен is habitual in Denmark, where it is a common surname, Greenland, and Norway, where it is quite a common surname (explore the name in all countries). In absolute terms, it is commonest in Denmark, the United States, and Norway.
| VARIANT | COUNTRY |
|---|---|
| Mortensen | Sweden, Norway, United States, Canada, Denmark |
| Мортенсен | Russia, Ukraine |
Martensson, Marthinsen, Marthinsson, Martienssen, Martinsen, Mortenson, Mortensson, Mårtensen, Mårtenson, Mårtensson, Мартинсен, Мартінсен, Мортенсон, Мортенссон, and מורטנסן