Cognomen Trollen (Troll 
, Troller , Trollen 
) , all over the world, is quite a common family name. The surname Trollen is habitual in Western Europe, particularly Switzerland, where it is quite a rare surname, Austria, and Germany. Measured by absolute frequency, it is the most numerous in Germany, the United States, and Switzerland. Very seldom, Trollen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Troll, Troller | Austria, Germany, France, United States, Switzerland |
| Trollen | United Kingdom, United States, South Africa |