Ancestors on my mom's side

Just yesterday, a high school friend of mine, who lives in Louisiana, put me in touch with her pastor. He has the same last name as one of my great great great grandfathers on my mother's side. We exchanged emails, and I'm waiting to hear if he knows (or has heard of) any of my relatives. He did comment that his relatives' gravesites were in (or near) Paducah, KY. That is where my mom was born, so I think we are probably related! :-) I hope he has some information on this family, because I have very little!