Family name Mikolj (Mikolj 
) , throughout the world, is a very rare cognomen. The last name Mikolj is characteristic of Slovenia, where it is a rare surname, Croatia, and Canada, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Southern Europe, particularly Slovenia, Croatia, and Italy. Much less frequently, Mikolj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mikolj | Slovenia, Italy, Canada, Croatia |