Schaible Family Genealogy Forum
One suggestion is:
If you know the name of the city, most all German people were Catholic or Lutheran.
I would suggest going to one of those Diocese and asking a priest how to write a letter to the Church in Germany and send the information that you need........names, date of birth, city, etc. Remember this, tho, use the German spelling of the name, not the Americanized version i.e., Jacob would be Jakob, John would be Johann or Johannnes, etc.
Hope this helps although someone else online may have a different view, which is great.......we can use all avenues of research......another thing, use the local churches where they lived, if they attended one, relatives married there, etc.