Cognomen Бейдун (Beydun 
, Бейдун 
) , in the world, is a very rare last name. The last name Бейдун is characteristic of Eastern Europe, particularly Bulgaria, where it is a rare surname, Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname. Very seldom, Бейдун is the forename as well as the last name.