Onomastics or onomatology is the study of proper names of all kinds and the origins of names. The words are from the Greek: "ὀνομαστικός" (onomastikos), "of or belonging to naming"[1][2] and "ὀνοματολογία" (onomatologia), from "ὄνομα" (ónoma) "name".[3] Toponymy or toponomastics, the study of place names, is one of the principal branches of onomastics. Anthroponomastics is the study of personal names.