Marilyn, as no one else has responded to your query I'll make a start: At least the Dunkards, Dunkers, Tunkers, German Baptist Brethren, all now generally called Church of the Brethren. But I suspect that at least initally it applied to all branches of the Swiss Anabaptist movement. Among other things, Anabaptist meant that they opposed infant baptism, believing that one should enter into religious communion only after having reached an age of informed consent. It seems to me then that the condition of infromed consent probably applied equally to all of the "plain sects" , i.e., Mennonites, Amish and later subdivisions such as River Brethren, Old Order Amish and Brethren in Christ. Jack Clopper, and from your names also researching Eshelman, Forrer, Groff/Grove.