noun A person who gave or supposedly gave their name to a people, place, institution, etc. .mw-parser-output .defdate{font-size:smaller}
The ancient Greeks and Romans tended to credit nearly every location and ethnicity to a legendary eponym: Hellas to Hellen, Rome to Romulus, Egypt to Aegyptus, etc.
noun Something that is named after a person.
noun A name or term taken or derived from the name of a person.
Alexandria (the name of a city in Egypt) is an eponym derived from the name of Alexander the Great.
noun A name or term taken or derived from any proper noun, inclusive of places, brands, etc.
The term tangerine is an eponym in reference to Tangier.
noun Synonym of epitome, a person taken as a symbol or quintessential representative of some trait, school, etc.
Rockefeller became the very eponym of wealth.
noun Synonym of epithet, a distinguishing title.
It was only posthumously that Julian was distinguished with the eponym "Apostate".