onomastic
adjective
on·o·mas·tic ˌä-nə-ˈma-stik 
: of, relating to, or consisting of a name or names
onomastically
ˌä-nə-ˈma-sti-k(ə-)lē
adverb 
Word History
Etymology
Greek onomastikos, from onomazein to name, from onoma name — more at name
First Known Use
1716, in the meaning defined above