onomatology
/ˌɒnəməˈtɒlədʒi/noun
The science or study of the formation of names or terms. Also: the history of names or naming practices. Occasionally as a mass noun: a discussion of this.
Origin
Mid 19th century. From onomato- + -logy. Compare post-classical Latin onomatologia, French onomatologie. Compare also Hellenistic Greek ὀνοματολόγος collector of words, person who tells people's names, nomenclator.