'''Klaasen''' is Dutch{{citation needed|date=December 2021}} patronymic surname ("son of Klaas"). Notable people with this name 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 (born 1957), South African/Canadian musician, daughter of Thandi Klaasen * {{interlanguage link|Luc Ex|lt=Luc Klaasen|de||nl|}} (born 1958), Dutch bassist known by his pseudonym ''Luc Ex'' * Raven Klaasen (born 1982), South African tennis player * Robert Klaasen (born 1993), Dutch footballer * Davy Klaassen (born 1993), Dutch footballer * Thandi Klaasen (1931–2017), South African musician, mother of Lorraine Klaasen
==See also== * 16958 Klaasen, a Mars-crossing asteroid *{{interlanguage link|Jan Klaasen|nl|}}, the Dutch puppet version of Pulcinella (Mister Punch) * Claassen * Klaassen * Klassen
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Category:Dutch-language surnames Category:Patronymic surnames Category:Surnames derived from given names