Save Gender Feminine Usage Japanese Scripts 夜涛鼓, 夜燈子, etc.(Japanese Kanji) Pronounced Pron. YAH-TO-KO [key] Meaning & History From Japanese 夜 (ya) meaning "night", 涛 (to) meaning "large waves" or 燈 (to) meaning "light" combined with 子 (ko) meaning "child". Other kanji combinations are possible.