Save Gender Feminine Usage Japanese Scripts 心夏, etc.(Japanese Kanji) Pronounced Pron. KO-KO-NAH-TSUU [key] Meaning & History From Japanese 心 (koko) meaning "heart, mind, soul" combined with 夏 (nattsu) meaning "summer". Other kanji combinations can form this name as well. Usage of this name is, most likely, influenced by the word coconut.