Last name Gadyan (Гадян 
, Гадиан , Gadyan 
) , all over the world, is a rare family name. The last name Gadyan is characteristic of Azerbaijan, where it is quite a rare surname, Russia, where it is a very rare surname, and Kazakhstan. Not in comparison with a country's population, the name is most common in Azerbaijan, Russia, and India. Likewise, Gadyan is the forename as well as the last name.