Cornelis is used in Sweden too. A very famous and popular singer/songwriter in Sweden was named Cornelis Vreeswijk (nickname Kees). He was originally from the Netherlands.
Cornelis is what the C stands for in M. C. Escher, a Dutch graphic artist famous for impossible constructions and works of architecture and tessellations.
Two of his most famous works are "Relativity" and "Hand with Reflecting Sphere".