Klaassen

Klaasen is Dutchpatronymic surname ("son of Klaas"). Notable people with this name include:

• Arno Klaassen (born 1979), Dutch bobsledder
• Davy Klaassen (born 1993), Dutch footballer
• Jozef Klaassen (born 1983), Dutch rower
• (1920–1992), Dutch economist
• Mihkel Klaassen (1880–1952), Estonian Supreme Court judge
• Nel Klaassen (1906–1989), Dutch sculptor
• René Klaassen (born 1961), Dutch field hockey player
• Fred Klaassen (born 1992), Dutch cricketer
• Ryan Klaassen, lead plaintiff in the 2021 vaccine law case Klaassen v. Indiana University

Klaassens

• Jan Klaassens (1931–1983), Dutch footballer