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Last name Арау (Arau , Арау ) , worldwide, is quite a rare cognomen. The family name Арау is habitual in Papua New Guinea, where it is quite a rare surname, Mexico, where it is a rare surname, and Panama. Measured by absolute frequency, it most frequently occurs in Mexico, Papua New Guinea, and the United States. Very seldom, Арау is the forename as well as the last name.