The information comes from various Deffler descendants, both in my line and others.
Tracing the Deffler family back beyond John has proven difficult since we do not find his name earlier than the 1850 Census. The format of those early censuses is a problem in this regard since they list only the head of household's name. The family story is that the first of our Deffler ancestors to arrive in the United States came with his maternal grandparents. Since maternal grandparents would, presumably, have a different surname, there would be no way to continue the line back without their name.