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Cognomen Arau (Arau , Арау , アラウ) , around the globe, is quite a rare last name. The surname Arau is characteristic of Papua New Guinea, where it is quite a rare surname, Mexico, where it is a rare surname, and Panama. Not in comparison with a country's population, it most frequently occurs in Mexico, Papua New Guinea, and the United States. Very seldom, Arau is the forename as well as the last name.