Save Gender Masculine Usage Japanese Scripts 幹郎, 幹雄, 幹士, 幹夫, etc.(Japanese Kanji) Pronounced Pron. MO-TO-O [key] Meaning & History From Japanese 幹 (moto) meaning "tree trunk" combined with 郎 (o) meaning "son", 雄 (o) meaning "hero, manly", 士 (o) meaning "samurai, warrior" or 夫 (o) meaning "man, husband". Other kanji combinations are possible.