An eponym is a person for whom something is named. It is derived from the Greek words 'epi, ' meaning 'UPON, ' and 'onoma, ' meaning 'NAME.' An eponym is typically a real person, although it can also refer to a fictional character or a place. Examples of eponyms include the sandwich named after the Earl of Sandwich, the Freudian slip named after Sigmund Freud, and the Turing Test named after Alan Turing.