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Family name Masato (Masato , マサト , 正人 ) , in the entire world, is a common cognomen. The family name Masato is characteristic of Japan, where it is quite a common surname, Tanzania, where it is quite a rare surname, and Taiwan. In absolute terms, this name is the most popular in Japan, China, and Tanzania. Much less frequently, Masato is the forename as well as the last name.