Family name Plasen (Plasen 
) , throughout the world, is a very rare cognomen. The last name Plasen is habitual in Thailand, where it is a very rare surname, Germany, where it is an extremely rare surname, and the United States. Very seldom, Plasen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Plasen | India, Germany, United States, Thailand |