The name Radun originates from the base name Rad. This name is recorded in the naming of a Cossack from the Cherkasy regiment in 1649, specifically Radun Zhdanenko. Currently, the name Radun is used among Serbs, Croats, and Bulgarians. In Croatian tradition, it is mentioned as early as the 12th century. The name Radun is also encountered in the patronymic of a Cossack from the Uman regiment in 1649, such as Mykhailo Radunenkо.