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Cognomen としお (Toshio , としお) , around the globe, is a common family name. The cognomen としお is habitual in Eastern Asia, particularly Japan, where it is quite a rare surname, Taiwan, where it is a rare surname, and Hong Kong. In absolute terms, it most frequently occurs in Eastern Asia, particularly Japan, China, and Taiwan. Much less frequently, としお is the forename as well as the last name.