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Last name Daigo (ダイゴ , Daigo , Даиго ) , around the world, is a common cognomen. The family name Daigo is habitual in Japan, where it is quite a rare surname, Philippines, where it is a rare surname, and Hong Kong. Not in comparison with a country's population, the name is most common in Japan, Philippines, and China. Much less frequently, Daigo is the forename as well as the last name.