No, -ich is not related to -wijk or -wich. There are cognate suffixes in the German-speaking areas (ending on -wyk, -wik, -wig, etc.) but -ich is not one of th

No, -ich is not related to -wijk or -wich. There are cognate suffixes in the German-speaking areas (ending on -wyk, -wik, -wig, etc.) but -ich is not one of them. German -ich is equivalent to -ik in Dutch-speaking areas.