Family name Dadashyan (Дадашян 
, Dadashyan 
, Дадашьян ) , throughout the world, is a rare last name. The family name Dadashyan is habitual in Armenia, where it is a rare surname, Russia, and Ukraine, where it is a very rare surname. In absolute terms, the name is most common in Russia, Ukraine, and the United States. Also, Dadashyan is the forename as well as the last name.