Perhaps the dictionary is wrong. After all, it never talks with anyone! It's just a list of words, and it doesn't know how to use them, just define them. Hence: Perhaps an eponym is a word derived from the name of a . . . Personality, rather than a person. Since there is obviously room for disagreement over what a person is (factual or fiction, veracious or mythic), then with "Personality", why that takes us a step away, and possibly "above" mere persons, to an ultimate (or more ultimate, possibly even most ultimate) Source, at which there ought be no quibbling over actuality or potentiality, just - absolute - Personality.