Looking for any relationships between Kastler clans originating from German-speaking countries. Current known spellings are Kastler, Kastner, Kasteler. there are about 5 core Kastler Families originating from Wahlern, Switzerland; Westhoffen, France; Trier, Saarland; Asselfingen, Germany; Lasberg, Austria. The Pope surname in this project is a result of researching my maternal grandfather. Feel free to join the Popes in this group.