Family name Gunnsteinsson (Gunnsteinsson 
) , in the entire world, is a very rare last name. The family name Gunnsteinsson is habitual in Iceland, where it is quite a common surname, Finland, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Gunnsteinsson | United States, Iceland, Finland |
| gunnar gunnsteinsson Icelandic actor, IS (b. 1969) |
|