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Surname シロウ (Shirou , Sirou , シロウ ) , all over the world, is a common cognomen. The family name シロウ is characteristic of Japan, where it is quite a rare surname, France, where it is a rare surname, and Belgium. In absolute terms, it is commonest in Japan, France, and Indonesia. Much less frequently, シロウ is the forename as well as the last name.