While perusing an online dictionary I stumbled across the word onomastics:

onomastics

SYLLABICATION: on·o·mas·tics
PRONUNCIATION: n-mstks
NOUN: (used with a sing. or pl. verb) 1a. The study of the origins and forms of proper names. b. The study of the origins and forms of terms used in specialized fields. 2. The system that underlies the formation and use of proper names or terms used in specialized fields.

The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved.

I was surprised that a Board search came up empty (or perhaps I searched incorrectly). It cross-threads rather
nicely with a few of our discussions, most recently WW's "terms of art".

Not expecting the thread to go anywhere, since I don't have a question about the word; just thought I'd share