Family name Baidun (Baidun 
, Байдун 
) , all over the world, is a rare surname. The last name Baidun is characteristic of Eastern Europe, particularly Belarus, where it is quite a rare surname, Russia, where it is a very rare surname, and Ukraine. In absolute terms, this name is the most popular in Belarus, Russia, and Indonesia. Much less frequently, Baidun is the forename as well as the last name.