Cognomen Pierus (Pierus 
) , in all the world, is an extremely rare last name. The surname Pierus is habitual in Northern America, particularly the United States, where it is an extremely rare surname. More prevalently, Pierus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Pierus | India, South Africa, United States |
| theodor pierus AT (b. 1862) |
|