Cognomen Тосунян (Тосунян 
, Tosunjan, Tosunian 
) , worldwide, is a rare family name. The family name Тосунян is habitual in Armenia, where it is quite a rare surname, Georgia, where it is a rare surname, and Russia. Not in comparison with a country's population, it is the most numerous in Russia, the United States, and Armenia. Likewise, Тосунян is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Тосунян | Bulgaria, Kazakhstan, Ukraine, Armenia, Russia |
| Tosunian | Georgia, Israel, Canada, United States, Argentina |
| Tosunyan | Germany, France, United States, Armenia, Russia |