Onomastics Definition
 ŏnə-măstĭks 
    noun
  
 The study of the origin, form, meaning, and use of names, esp. proper names.
 Webster's New World 
The study of the origins and forms of terms used in specialized fields.
 American Heritage 
A pattern or system serving as a basis for the formation and use of names and terms within a field or category.
 Webster's New World 
Origin of Onomastics
-  
1936, preceded by adjective onomastic (“of or belonging to naming") (1716), from French onomastique, from Ancient Greek ὀνομαστικός (onomastikos), from ὀνομαστός (onomastos, “named"), form of ὀνομάζω (onomazō, “I name"), from ὄνομα (onoma, “name"), from Proto-Indo-European *h₃nh₃mnÌ¥ (“name") (English name).
From Wiktionary
 
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