Many of the inhabitants who speak only German and not Danish do not consider the region any different from the rest of Schleswig-Holstein. This notion is disputed by those defining themselves as Danes, South Schleswigans or Schleswigans, particularly historians and people organised in the institutions of the Danish minority of Southern Schleswig, such as the South Schleswig Voter Federation. Many of the last names found in the region are very often of Scandinavian or Danish form, with the -sen endings like Petersen.