Last name Садаян (Садаян 
, Sadoyan 
) , in the world, is a rare family name. The surname Садаян is characteristic of Armenia, where it is quite a rare surname, Estonia, where it is a rare surname, and Russia, where it is a very rare surname. Measured by absolute frequency, it is commonest in Armenia, Russia, and the United States. Very seldom, Садаян is the forename as well as the last name.