A person after whom something is named, or the name itself that comes from a person's name.
From Greek 'epōnymos' (giving name), from 'epi' (upon) + 'onyma' (name). First used in English in the 18th century to describe the practice of naming things after people.
A 'sandwich' comes from the Earl of Sandwich, a 'diesel engine' from Rudolf Diesel—eponyms are how people accidentally immortalize themselves in everyday language, achieving a weird kind of forever-fame.
Complete word intelligence in one call. Free tier — 50 lookups/day.