Not much, but maybe this will help -- if you get lucky.
Try getting the local church records for your family members who immigrated.Find their local parish and ask for marriage, birth/baptism, etc. records.(You have to give the church as much as you know on names, ages and dates so they have some idea of who they are looking for and when.)
You might just get "Paul and ---- Kirsch of Germany" or you might get real lucky like I did on my Lauer family.Didn't have a clue where the Lauers came from, but a Catholic church marriage record in Pittsburgh for their oldest daughter read, "daughter of Johann Lauer and Anna Maria Bender both from Schriesheim, Baden, Germany."