Medieval records of the name Zador suggest that during that time it functioned as a personal name. This name originates from the palliative "zador," which means "splinter" (Rymut II 717).The earliest records of this name come from the lands that were part of the Hungarian kingdom in the XIII-XIV centuries, but there are also references from Eastern Slavic and Polish territories. For instance, in 1221, serfs named Zadur, Petro, Dedo, and others are mentioned in the Borsod County (Reg Var 272). In 1534, the anthroponym "Ivan Zador" was recorded, a peasant from the Bilozer County (Tup 155). In 1691, in the city of Uzhhorod, a widow named Zador Mihalyne is mentioned (Hod Ad).In Eastern Slovakia, a village named Zadorfalva is mentioned starting from 1391, which likely received its name in honor of its founder or owner - Zador (Nagy I 509-512). In Polish lands during the XV century, surname-like designations such as Petrus Zadora and Thoma Zadora are also recorded (SSNO V I/252, VII/30; see also Rymut II 217).