Cognomen Sigtryggsdottir (Sigtryggsdottir 
) , in all the world, is a very rare family name. The cognomen Sigtryggsdottir is characteristic of Iceland, where it is quite a common surname, Norway, where it is a very rare surname, and France, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sigtryggsdottir | Iceland, Norway, France |