(a.) Relating to an eponym; giving one's name to a tribe, people, country, and the like.

abessive ablative accusative adessive allative appellative approximative byname case cognominal common case dative delative denominative diminutive elative epithetic eponymic eponymous essive formal genitive honorific hypocoristic illative in name only inessive instrumental lative local case locative nominal objective case oblique case perlative possessive case prepositional quasi self-called self-christened self-styled so-called soi-disant subject case sublative superessive terminative titular translative vocative would-be