Another name of Amaterasu was "Ohirumenomuchi"--this "ru" is an ancient equivalent of the preposition "no," which means "hirume" would become "hinome" ("sun woman") in modern Japanese.
アマテラスの別名は「大日孁貴」（オオヒルメノムチ）であり、この「ヒルメ」の「ル」は助詞の「ノ」の古語で、「日の女」となる。