"eponym" in the noun sense
1. eponym
the person for whom something is named
"Constantine I is the eponym for Constantinople"
2. eponym
the name derived from a person (real or imaginary
"Down's syndrome is an eponym for the English physician John Down"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License