Search gender: all male female ムツマ Japanese Boy Names Variations. 1 names found. gender: all male female Name: mutsuma Katakana: ムツマ 0 Kanji: 六真 Meaning: 六Six. Sixth. Kanji character for the number 6 (six). A number that is one more than five. 真True. Truth, not falsehood. Nature as it is. True form. Innate. You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > ムツマ Japanese Boy Names Variations.