Family name Dag-Bjoern (Dag-Bjoern 
) , across the world, is an extremely rare cognomen. Much more frequently, Dag-Bjoern is the forename as well as the last name. Parts of the name also exists independently as a first name Dag, and a first name Bjoern.
| VARIANT | COUNTRY |
|---|---|
| Dag-Bjoern | Norway |