Last name Мортенсон (Mortenson 
, Мортенсон, Mårtenson 
) , all over the world, is quite a rare family name. The family name Мортенсон is habitual in Sweden, where it is quite a rare surname, the United States, and Canada, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Mortenson | United Kingdom, Germany, Australia, Canada, United States |
| Mårtenson | Finland, Sweden |
Martensson, Marthinsen, Marthinsson, Martienssen, Martinsen, Mortensen, Mortensson, Mårtensen, Mårtensson, Мартинсен, Мартінсен, Мортенсен, Мортенссон, and מורטנסן