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Last name Belau (Palau , Belau , Blauw ) , throughout the world, is a common cognomen. The cognomen Belau is habitual in Andorra, where it is quite a common surname, Spain, where it is quite a rare surname, and Puerto Rico. Measured by absolute frequency, the name is most common in Spain, Germany, and Colombia. Likewise, Belau is the forename as well as the last name.