Domastoy is an ancient rare digamous name composed of the Slavic adverb "doma" and the verb "stati." The first mention of this name dates back to 1443, where it is recorded as Domastoy. The name also appears in documents from 1445 as Mączko Domastoy. The anthroponym "Domastoy" is referenced in other written records, including German-language documents related to Lviv in the 15th century. For example, in 1443, it is recorded as Maczek Domastoy.
