Hi Wayne, you'll find the list of surnames, ordered by frequency, here:
https://geneee.org/g?lang=en&m=N&tri=F
Names that appear at least 100 times are (sorted by count): Schmidt, Jenne, Adler, Danzeisen, Höfflin, Meier, Krumm, Hiss, Boos, Sexauer, Dier, Wiedemann, Ernst, Müller, Rinklin, Schumacher, Gross, Schmidlin, Frei, Brenn, Gerber, Bühler, Weiss, Brandenberger, Bär, Stein, Bockstahler, Joseph, Lay, Trautwein, Kaufmann, Heckel, Wahrer, Breisacher, Hornecker, Enderlin, Berger, Rieflin, Zimmerlin, Beck, Bürkin, Sommer, Bieselin, Fischer, Brodbeck, Bossert, Gutmüller, Walz, Merklin, Kreutner, Schneider, Huber, Koch, Bernert, Schulz, Schöpflin, Hess, Gasser, Häsig, Roth, Kaiser, Kromer, Birmelin, Köbelin, Wolf, Jakob, Engler, Textor, Grün, Dinger, Henninger, Holdermann, Scherzer, Eselgroth, Giesin, Heinzmann, Fäustlin, Möcklin, Geisert, Steinmann, Vollweider, Boch, Jösslin, Maurer, Männer, Geiger, Stählin, Moritz, Erschig, Dreher, Göring, Kümmerlin, Schnaiter, Klaus, Danner, Vögtlin, Neidecker, Wintermantel