Cognomen Iashan (Iashan 
, Яшан 
) , in all the world, is a rare family name. The surname Iashan is characteristic of Ukraine, where it is quite a rare surname, Kyrgyzstan, where it is a rare surname, and Russia, where it is a very rare surname. In absolute terms, this name is the most popular in Ukraine, Russia, and India. Very seldom, Iashan is the forename as well as the last name.