What is "klaasen"

Klaasen is a surname. Notable people with the surname include:

• Berton Klaasen (born 1990), South African rugby union player
• Heinrich Klaasen (born 1991), South African cricketer
• Jelle Klaasen (born 1984), Dutch darts player
• Lorraine Klaasen, Canadian musician
• Raven Klaasen (born 1982), South African tennis player
• Robert Klaasen (born 1993), Dutch footballer
• Thandi Klaasen (born 1931), South African musician