onomatology
noun
on·o·ma·tol·o·gy ˌä-nə-mə-ˈtä-lə-jē 
: onomastics
onomatologist
ˌä-nə-mə-ˈtä-lə-jist
noun 
Word History
Etymology
French onomatologie, from Greek onomat-, onoma name + French -logie -logy
First Known Use
1845, in the meaning defined above