These are some of my surnames from Hannover area:
Niebuhr, Ahrens, Gartner, Harberg (Binnen, Nienburg/Weser)
Muffelmann, Wehland, Clausen, Stover (Dorverden)
Mueller, Schumacher, Dreyer, Buckman, Siemers, Kolnsberg,
Timke, Hobichthorst (Asendorf, Diepholz).
Sorry about some umlauts missing.
Don Burke