Last name Tachtchian (Ташчян 
, Тащян , Tachtchian 
) , worldwide, is a rare family name. The cognomen Tachtchian is habitual in Russia, where it is a rare surname, Ukraine, where it is a very rare surname, and Canada, where it is an extremely rare surname. In absolute terms, it is the most numerous in Russia, Ukraine, and the United States. Likewise, Tachtchian is the forename as well as the last name.