Cognomen Arnt-Olav (Arnt-Olav 
) , in the world, is an extremely rare last name. Predominantly, Arnt-Olav is the forename as well as the last name. Parts of the name also exists independently as a first name Arnt, and a first name Olav.
| VARIANT | COUNTRY |
|---|---|
| Arnt-Olav | Norway |
Enger, Valvik, and Mellemstrand