Family name Clareus (Clareus 
) , throughout the world, is a very rare last name. The surname Clareus is characteristic of Sweden, where it is a rare surname, Greece, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Clareus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Clareus | Greece, United States, Philippines, Sweden |
| märta clareus (b. 1907) |
|