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Family name Nagao (ナガオ , Nagao , Нагао ) , in all the world, is quite a rare last name. The surname Nagao is habitual in Japan, where it is a rare surname, Brazil, and Hong Kong. Not in comparison with a country's population, this name is the most popular in Japan, Brazil, and the United States. More frequently, Nagao is the forename as well as the last name.