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Surname Dalmau (Dalmau , 达尔莫 ) , all around the world, is quite a common last name. The cognomen Dalmau is characteristic of Andorra, where it is quite a common surname, Spain, where it is quite a rare surname, and Puerto Rico. In absolute terms, it is commonest in Spain, Argentina, and France. Likewise, Dalmau is the forename as well as the last name.