Family name Gadun (Gadun 
, Гадун 
) , all over the world, is a rare last name. The surname Gadun is habitual in Belarus, where it is quite a rare surname, Ukraine, where it is a rare surname, and Kazakhstan, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Belarus, Ukraine, and Indonesia. Much less frequently, Gadun is the forename as well as the last name.