Last name Iasar (Ясар 
, Iasar 
, Ясер 
) , around the world, is a rare surname. The cognomen Iasar is characteristic of Romania, where it is quite a rare surname, Armenia, where it is a rare surname, and Belarus. Measured by absolute frequency, the name is most common in Eastern Europe, particularly Romania, Russia, and Ukraine. Likewise, Iasar is the forename as well as the last name.