Where are my Kemmler’s from?

My research has started with my hometown Wankheim and the surrounding towns like Maehringen, Jettenburg, Immenhausen, Kusterdingen (the Haerten area), Stockach, Betzingen, Reicheneck, Pfullingen, Ohmenhausen, Bronnweiler, Goenningen, Undingen, Gomaringen, Hinterweiler,