I think I might be able to help.
My late grandfather Jan Pieter Stassen was born in Stokkem in Belgium. Family of his granfather emigrated to Minnesota around the 1892that. One of the descendant was Harold Stassen, Minessota's one time governer I believe. The town in Belgium which I can trace my family to is Dilsen in Limburg.
I have a family tree I have drawn up and an old scanned newspaper article in flemish my grandad gave me about the Stassen family in America.
I hope this helps
Regards michel smit