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Surname Klausa (Klausa , Clausa , Clausus ) , globally, is a rare last name. The last name Klausa is characteristic of Latvia, where it is a rare surname, Poland, and Germany, where it is a very rare surname. Measured by absolute frequency, the name is most common in Germany, Poland, and Brazil. Likewise, Klausa is the forename as well as the last name.