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Cognomen トシユキ (Toshiyuki , トシユキ , Tosiyuki ) , around the globe, is a common surname. The last name トシユキ is habitual in Japan, where it is quite a common surname, Singapore, where it is a rare surname, and Hong Kong. In absolute terms, it is the most numerous in Japan, China, and Singapore. Much less frequently, トシユキ is the forename as well as the last name.