Cognomen Смоян (Смоян 
, Smoian 
, Smoyan 
) , across the world, is quite a rare surname. The cognomen Смоян is habitual in Georgia, where it is a rare surname, Russia, and Armenia. Much less frequently, Смоян is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Смоян | Russia, Armenia, Kazakhstan, Ukraine |
| Smoian | Russia, Georgia |
| Smoyan | Latvia, France, Armenia, Greece, Russia |