Surname Rostir (Rost 
, Rosten 
, Rostir 
) , in the entire world, is a common cognomen. The surname Rostir is habitual in Germany, where it is quite a common surname, Norway, where it is quite a rare surname, and Finland. In absolute terms, the name is most common in Germany, the United States, and Brazil. Very seldom, Rostir is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rost | Germany, Argentina, Brazil, Poland, United States |
| Rosten | Norway, Sweden, Brazil, Poland, United States |
| Rostir | Spain |
| Ruszt | Hungary |