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Cognomen Tsukasa (司 , Tsukasa , ツカサ ) , around the globe, is a widespread last name. The cognomen Tsukasa is characteristic of Eastern Asia, particularly China, where it is quite a common surname, Japan, and Taiwan, where it is a rare surname. Measured by absolute frequency, it is commonest in China, Japan, and Indonesia. Very seldom, Tsukasa is the forename as well as the last name.