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Last name Wau (Wau , Wouw , وواو) , across the world, is quite a common family name. The surname Wau is habitual in Netherlands, where it is quite a rare surname, Papua New Guinea, and Taiwan. Not in comparison with a country's population, the name is most common in Indonesia, Netherlands, and Papua New Guinea. Very seldom, Wau is the forename as well as the last name.