As my wifes single name was also AFFENTRANGER I have some knolwedge about. First of all, the name affAntranger does not exist in Switzerland but affEntranger. It has happened very often that during the imgration prozess names have not been written down the correct way. The main place the name comes from is called MUESWANGEN. Mueswangen is a verry little farmer town in the canton of lucern. Typ the towns name into any search machine such as google and you will find more information. You may contact there the church administration.