A couple of years ago, I spent dozens of hours entering all the names, dates, relationships, etc. for my branch of the Luhn family into a geneology database. Much of the information came directly from my relatives in Germany and is known to be accurate. I think the "tree" goes back 13 generations.
I havn't done much with the program since that time, other than to add a few entries related to my immediate family.
I did a quick search for Johann Luhns; there were many entries, but none matched your time frame.
I would be happy to share the whole file with you or any other "Luhn seeker" who is interested in it. I don't know the best way to do this as I am a borderline Computerdolt when it comes to data manipulation. What do you suggest?
. . . Chris