Save Gender Masculine Usage Japanese Scripts 睦乎, 六乎, etc.(Japanese Kanji) Pronounced Pron. MOO-TSOO-YAH [key] Meaning & History From 睦 (boku, moku, mutsu.bu, mutsu.mu) meaning "friendly, harmonious, intimate", or 六 (riku, roku, mu, mui, mu'.tsu, mu.tsu) meaning "six", combined with 乎 (ya) an interrogative particle. Other kanji combinations are possible.