Jan van Cronenburch tells us that he came from Cronenburch. Modern spelling is "van Kronenburg" or "van Cronenburg". It is also possible with 2 o's instead of 1.
has explanations about dutch familynames.
Cronenburch was a castle. According to http://igitur-archive.library.uu.nl/sabine/2011-1004-200800/...
it is the name of a castle between Loenen and Nieuwersluis on the river Vecht in the province Utrecht.