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In all the world, Masashiro (Masashiro ) is an extremely rare masculine first name. Much less frequently, Masashiro is the last name as well as the forename.
マサシロ
Ito, Ono, Chih, Saito, Hamano, Hagiya, Tashiro, Noguchi, Hayashi, Sugavara, Tsukagoshi, Nagaishi, Watanabe, Yamamoto, Yamauchi, and Kobayashi