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Cognomen Seigo (Seigo , セイゴ , 塞戈 ) , all around the world, is quite a common family name. The cognomen Seigo is characteristic of Japan, where it is quite a rare surname, Singapore, where it is a rare surname, and Canada, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Japan, China, and the United States. Much less frequently, Seigo is the forename as well as the last name.