Surname Borstnar (Borstnar 
) , in all the world, is a rare cognomen. The last name Borstnar is characteristic of Slovenia, where it is quite a common surname, Sierra Leone, where it is quite a rare surname, and Austria, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Borstnar | Sierra Leone, Austria, United States, Slovenia, Germany |
| nils borstnar (b. 1966) |
|