onomastics

n. (Lexicology) study of the origins of proper names; system that lies under the forming of terms within a specific vocabulary

Onomastics or onomatology is the study of proper names of all kinds and the origins of names. The word is derived from the Greek word όνομα (onoma), meaning name. Toponymy or toponomastics, the study of place names, is one of the principal branches of onomastics. Anthroponomastics is the study of personal names.
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Noun
1. the branch of lexicology that studies the forms and origins of proper names
(hypernym) lexicology

onomastics /,ɔnou'mæstiks/
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