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Cognomen Xavér (Xaver , Xavér ) , around the world, is a rare last name. The family name Xavér is habitual in Liechtenstein, where it is quite a common surname, Austria, where it is a rare surname, and Slovenia. In absolute terms, the name is most common in the United States, Indonesia, and Germany. Much more frequently, Xavér is the forename as well as the last name.