Save Gender Masculine Usage Japanese Scripts 盈弘, 允裕, 円博, 光宏, 光大, 光比呂, 光容, etc.(Japanese Kanji) Pronounced Pron. MEE-TSUU-HEE-ṘO [key] Meaning & History From Japanese 盈 (mitsu) meaning "fill" combined with 弘 (hiro) meaning "to spread, enlarge, expand". Other kanji combinations are possible.A famous bearer is Mitsuhiro Sato, a Japanese sprinter who specializes in the 400 metres.