Last name Aygyun (Айгюн 
, Аыгюн , Айгюнь 
) , across the world, is a rare family name. The cognomen Aygyun is characteristic of Azerbaijan, where it is quite a rare surname, Bulgaria, where it is a rare surname, and Belarus, where it is a very rare surname. In absolute terms, it is commonest in Azerbaijan, Russia, and Ukraine. More prevalently, Aygyun is the forename as well as the last name.