Name statistics in Germany: https://www.name-statistics.org/de/numetara.php?pagina=1312
Name project:Link. Das Digitale Familiennamenwörterbuch Deutschlands (DFD)
German names (endings of names): https://wiki.genealogy.net/Kategorie:Familienname_mit_gleicher_Endung
Medieval Names: https://www.s-gabriel.org/names/german.shtml