Save Gender Masculine Usage Japanese Scripts 哲一, 徹一, 鉄一, etc.(Japanese Kanji) Pronounced Pron. TE-TSUU-EE-CHEE [key] Meaning & History From Japanese 哲 (tetsu) meaning "philosophy, clear", 徹 (tetsu) meaning "penetrate" or 鉄 (tetsu) meaning "iron" combined with 一 (ichi) meaning "one". Other combinations of kanji characters can also form this name.