Van der Kolk is a Dutch toponymic surname, meaning "from/of the kolk". The surname Van der Wiel has a same origin. It could also have referred to a specific settlement or water named De Kolk. People with the surname include: Bessel van der Kolk (born 1943), Dutch psychiatrist. Henk Van der Kolk, Canadian film producer. Jacobus Schroeder van der Kolk (1797–1862), Dutch physician. Kirsten van der Kolk (born 1975), Dutch rower. Marie José van der Kolk (born 1974), Dutch singer known as Loona. Nick van der Kolk, American podcaster and actor.
https://en.wikipedia.org/wiki/Van_der_Kolk