Cognomen Fierus (Fierus 
) , around the world, is a rare surname. The cognomen Fierus is characteristic of Germany, where it is a rare surname, Malaysia, where it is a very rare surname, and France. Much less frequently, Fierus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Fierus | Germany, United States, Malaysia, France |