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Cognomen マサシ (Masashi , Masasi , マサシ ) , in the entire world, is a common last name. The last name マサシ is habitual in Japan, where it is quite a common surname, Tanzania, and Zimbabwe, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Japan, Tanzania, and China. Much less frequently, マサシ is the forename as well as the last name.