Cognomen Sigmarsdottir (Sigmarsdottir 
) , in the entire world, is a very rare family name. The family name Sigmarsdottir is habitual in Iceland, where it is quite a common surname, Spain, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Sigmarsdottir is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sigmarsdottir | Iceland, Spain, United States |