Family name Тонапетян (Тонапетян 
, Tonapetyan 
) , all over the world, is a rare last name. The cognomen Тонапетян is habitual in Armenia, where it is a rare surname, Bulgaria, and Russia, where it is a very rare surname. In absolute terms, it is the most numerous in Russia, Armenia, and the United States. More prevalently, Тонапетян is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Тонапетян | Ukraine, Armenia, Russia |
| Tonapetyan | Bulgaria, Armenia, United States, Germany, Russia |