Last name Hreinsdottir (Hreinsdottir 
) , throughout the world, is a rare surname. The cognomen Hreinsdottir is habitual in Iceland, where it is quite a common surname, Sweden, where it is a rare surname, and Switzerland, where it is a very rare surname. In absolute terms, it most frequently occurs in Iceland, Spain, and Sweden. Very seldom, Hreinsdottir is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Hreinsdottir | Sweden, Iceland, Switzerland, Spain, United States |