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Surname テツヤ (Tetsuya , テツヤ , Tetuya ) , globally, is a common cognomen. The cognomen テツヤ is habitual in Japan, where it is quite a common surname, Singapore, where it is a rare surname, and Indonesia. Measured by absolute frequency, it is the most numerous in Japan, China, and Indonesia. Very seldom, テツヤ is the forename as well as the last name.