Surname Grusen (Grusen 
) , globally, is a very rare last name. The last name Grusen is characteristic of Northern Europe, particularly Sweden, where it is a rare surname, Norway, and Denmark, where it is a very rare surname. Measured by absolute frequency, the name is most common in Germany, Sweden, and Norway.
| VARIANT | COUNTRY |
|---|---|
| Grusen | Netherlands, Norway, Sweden, Denmark, Germany |