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Cognomen Seiji (Seiji , Сэйдзи , Сэидзи, along with others...) , throughout the world, is quite a rare last name. The surname Seiji is habitual in Japan, where it is quite a rare surname, Taiwan, where it is a rare surname, and Singapore. Measured by absolute frequency, it most frequently occurs in Eastern Asia, particularly Japan, China, and Taiwan. Likewise, Seiji is the forename as well as the last name.