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Gender: M Origin of Klaus: German variation of Claus, diminutive of Nicolas

Two drawbacks: some unpleasant World War II associations, and the Santa clause.

Famous People Named Klaus

Klaus Kinski, German actor
Klaus Meine, lead singer of German hard rock band The Scorpions
Klaus Badelt, German composer, most famous work to date is from Pirates of the Caribbean
Klaus von Klitzing, winner of the Nobel Prize in Physics
Klaus Werner Iohannis, President of Romania
Klaus Voormann, musician and artist that created The Beatles' 'Revolver' album cover.

Pop Culture References for the name Klaus

Niklaus "Klaus" Mikaelson, character from "The Vampire Diaries" and "The Originals"
Klaus Baudelaire, from "A Series of Unfortunate Events"
Klaus Goldstein, date able character from Shall we Date?Wizardess Heart older brother of Elias Goldstein

Klaes, Klaas, Claus