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Last name Sirou (思柔 , Sirou , シロウ ) , all around the world, is a common family name. The cognomen Sirou is characteristic of Japan, where it is quite a rare surname, France, where it is a rare surname, and Belgium. Not in comparison with a country's population, it is commonest in Japan, France, and Algeria. Very seldom, Sirou is the forename as well as the last name.