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Cognomen 司 (司 , Tsukasa ) , worldwide, is a widespread family name. The last name 司 is habitual in Eastern Asia, particularly China, where it is quite a common surname, Japan, where it is a rare surname, and Taiwan. Measured by absolute frequency, this name is the most popular in China, Japan, and Indonesia. Very seldom, 司 is the forename as well as the last name.