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Family name マサオ (Masao , マサオ ) , worldwide, is a common surname. The cognomen マサオ is characteristic of Japan, where it is quite a common surname, Tanzania, where it is quite a rare surname, and Taiwan. Not in comparison with a country's population, it is the most numerous in Japan, Tanzania, and China. Much less frequently, マサオ is the forename as well as the last name.