Family name Smolij (Smolij 
, Смолий 
) , all around the world, is a rare last name. The family name Smolij is characteristic of Belarus, where it is a rare surname, Russia, and Kazakhstan, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Eastern Europe, particularly Russia, Belarus, and Ukraine. Very seldom, Smolij is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Smolij | Peru, Ecuador, Argentina, United States, Poland |
| Смолий | Kazakhstan, Ukraine, Belarus, Russia |