Just got home from work and picked up your message. Several years ago when I was doing everything by "snail mail" I was corresponding with a nun from an area around St. Louis, I beleive it was St. Charles.
Anyway, she sent me a great deal of her information and we could never connect the families. I remember that they were from a place in Donnegal called Killebegs, I believe.
If you are interested or part of that grouping I would be glad to copy it and send it off to you. This was in the 80's and she was getting on in years but had done a lot of research.
Please let me know.