Eponym
From HandWiki
An eponym is a person, place, or thing after whom or after which something is named, or believed to be named, or the thing so named. The adjectives derived from eponym include eponymous and eponymic. For example, Elizabeth I of England is the eponym of the Elizabethan era, and "the eponymous founder of the Ford Motor Company" refers to Henry Ford, and Ford and Elizabethan England are both eponyms.