Its my pleasure to respond to your request about Jacob Stocker born 1634 from Kottwil in Kanton Luzern Switzerland. It would be very interesting for me if you could tell me who found(or where is found the proof) that the Preuschdorf/Mitschdorf/Goersdorf-branch with Jakob Stocker came for sure from Kottwil.
My own interest in this comes from the fact that my oldest ancester is from Epfig (Alsace): Jean Stocker born 1631 which was married to Anna Waldmeyer. Waldmeyers are also found in the neighbor village (Dambach-La-Ville). All Waldmeyers (with Y) from Epfig and Dambach-La-Ville came from the Fricktal in Switzerland for sure. The Suisse villages were Möhlin, Mumpf, Obermumpf and Zuzgen. The Waldmeyer family and the Stocker family were early residents of these villages down to a bout 1670. Before this time unfortunately no churchbooks have survived the war, but the Waldmeyer-Stocker connection still exists in that region nowadays (even in the phone book).
Interesting in the historical context is that most of them (if not all) came in waves from Switzerland around 1649-1653. At that time 30-years war had destroyed many farms in Fricktal and due to the Westfalian Peace prizes of food and of taxes exploded in whole Switzeland. They went together with many others from Switzerland towards Palatinate which was almost deserted of peoply by the war. Since this was more than 200 km to walk, many took a first treck towards the region of Colmar. There is some evidence that besides many Anabaptists from the Zürich region also many catholic Fricktal residents took the same route. I am wondering if the Stocker branch from Preuschdorf knew of the Epfig branch.
Most intriguing for me is that the names of both branches in Alsace do cantain mostly identical prenamesincluding Jean, Michel, George.
For you information I have posted the Palatinate-Stocker branch (my own) on geneanet: