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Last name تاداشي (Tadashi , تاداشي) , worldwide, is quite a common cognomen. The cognomen تاداشي is habitual in Japan, where it is quite a rare surname, Taiwan, and Singapore, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Eastern Asia, particularly Japan, China, and Taiwan. Much less frequently, تاداشي is the forename as well as the last name.