Franz Miklosich wrote that the word, of Croatian origin, probably was expanded by the Croats among the Bulgarians and Serbs, while if it is Persian, than among Slavs is borrowed from the Turks. Erich Berneker wrote that became by contraction from "bojan", which was borrowed from Mongolian-Turkic "bajan" ("rich, wealthy"), and noted Bajan is a personal name among Mongols, Avars, Bulgars, Altaic Tatars, and Kirghiz. Đuro Daničić decided for an intermediate solution; by origin is Avar or Persian from "bajan" (duke).