Cognomen Niclassen (Niclassen 
) , across the world, is a rare family name. The family name Niclassen is habitual in Iceland, where it is quite a rare surname, Denmark, where it is a rare surname, and Germany, where it is a very rare surname. Much less frequently, Niclassen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Niclassen | Iceland, Denmark, Germany |
| carl friedrich niclassen DE (b. 1832) |
|