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Cognomen Alau (Alau ) , in the entire world, is a rare last name. The family name Alau is habitual in Papua New Guinea, where it is quite a rare surname, Malaysia, where it is a rare surname, and Ethiopia. Not in comparison with a country's population, the name is most common in Papua New Guinea, Ethiopia, and Indonesia. More prevalently, Alau is the forename as well as the last name.