Family name Стяпонавичус (Стяпонавичус 
) , around the globe, is an extremely rare last name. The family name Стяпонавичус is characteristic of Eastern Europe, particularly Russia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Стяпонавичус | Russia |
Вальдас, and Валянтинас