Surname Iasan (Iasan 
, Ясан 
) , around the world, is a rare cognomen. The last name Iasan is habitual in Eastern Europe, particularly Moldova, where it is quite a rare surname, Russia, where it is a very rare surname, and Ukraine. Not in comparison with a country's population, it most frequently occurs in the United States, Russia, and Moldova. Very seldom, Iasan is the forename as well as the last name.