Eponymous

EPONYMOUS, that which gives a name to anything (Gr. eiruvvnos, from 6vofia, a name) , a term especially applied to the mythical or semi-mythical personages, heroes, deities, &c. from whom a country or city took its name. Thus Pelops is the giver of the name to the Peloponnese. At Athens the chief archon of the year was known as the apx&v ejrajcujttos, as the year was known by his name. There was a similar official in ancient Assyria. In ancient times, as in historical and modern cases, a country or a city has been named after a real personage, but in many cases the person has been invented to account for the name.