Save Gender Masculine Usage Japanese Scripts 真大, 仁広, 誠裕, etc.(Japanese Kanji) Pronounced Pron. MAH-SAH-KHEE-RO [key] Meaning & History From 仁 (masa) meaning "benevolence" or 誠 (masa) meaning "sincerity" combined with 広 (hiro) meaning "vast, wide". Other kanji combinations can be used.