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Family name Tsuyoshi (毅 , Tsuyoshi , 剛 ) , globally, is a widespread last name. The surname Tsuyoshi is characteristic of China, where it is quite a common surname, Japan, where it is quite a rare surname, and Singapore, where it is a rare surname. Measured by absolute frequency, it is commonest in China, Japan, and Indonesia. More prevalently, Tsuyoshi is the forename as well as the last name.