Last name Rosler-Koslar (Rosler-Koslar 
) , worldwide, is an extremely rare surname. The cognomen Rosler-Koslar is characteristic of Western Europe, particularly Germany, where it is an extremely rare surname. Parts of the name also exists independently as a last name Rosler, and a last name Koslar.
| VARIANT | COUNTRY |
|---|---|
| Rosler-Koslar | Germany |