Claussen:

• Clausen is a Danish patronymic surname, literally meaning child of Claus, Claus being a German form of the Greek Νικόλαος, Nikolaos used in Denmark at least since the 16th century. The spelling variant Klausen has identical pronunciation (as does the often interchangeable Claussen).
• The spelling variant Klausen has identical pronunciation (as does the often interchangeable Claussen). The two variants are number 34 and 85 on the top100 of surnames in Denmark. Occurrences of Clausen/Klausen as a surname outside Denmark and Schleswig-Holstein are due to immigration.
• Dutch, North German, Danish, and Norwegian: patronymic from the personal name Claus, a reduced form of Nikolaus (see Nicholas).

Based on the name Claus (Klaus):

• From the Greek name Νικολαος (Nikolaos) which meant “victory of the people” from Greek νικη (nike) “victory” and λαος (laos) “people.” Saint Nicholas was a 4th-century bishop and the patron saint of children, sailors and merchants, as well as Greece and Russia. He formed the basis for the figure known as Santa Claus (created in the 19th century from Dutch Sinterklaas).
• Due to the renown of the saint, this name has been widely used in the Christian world.

To summarize, the meaning of Claussen breaks down into son of Claus. Claus derives from the Greek Nikolas, which means “Victory of the People.” In short, Claussen means “Son of Victory of the People.” The name has origins in Denmark and Schleswig-Holstein, Germany, and that tends to be the source of anyone with a similar name to Claussen. The spelling is completely arbitrary.