I believe that my ancestor Teunis Coeckman (1530) may have been born in Zwolle, Brabrant but I am not sure. His son Claas Thonis (1558) apparently was a crook as he cheated bakeries with non delivery of cakes. His son was born in Vlaardingen, Zuid Holland in 1583 but the last name was changed to Rietdijck. Does anyone know where I can find out if I am right? Any help would be appreciated.