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Cognomen Nagaoka (ナガオカ , Nagaoka , Нагаока ) , in all the world, is quite a rare surname. The last name Nagaoka is characteristic of Paraguay, where it is quite a rare surname, Japan, where it is a rare surname, and Brazil. In absolute terms, this name is the most popular in Japan, Brazil, and the United States. More frequently, Nagaoka is the forename as well as the last name.