It's quite possible that the MS Porterfield's are distant cousins! My ancestor is James Porterfield who was born in 1777 in Donegal, Ireland, a son of William Portefield. I know Wm. had at least one other son, John, who married Mary Robb, the sister of James' wife, Mary. They emigrated to Lancaster, PA , before moving on to Belmont Co., OH. If I could ever get my hands on the Porterfield book, I could probably find the connection. Thanks for your interest.