Save Gender Masculine Usage Japanese Scripts 空斗, 空叶, etc.(Japanese Kanji) Pronounced Pron. KUU:-TO [key] Other Forms FormsKuto, Kūto Meaning & History From Japanese 空 (kuu) meaning "sky" combined with 斗 (to), which refers to a Chinese constellation or 叶 (to) meaning "grant, answer". Other kanji combinations are possible.