Probably coincidence, but I have an ancestor named Thomas Coulson who married Martha(Mary)Wiley about 1725 at West Nottingham, MD. This would be a few generations earlier than your Sam, however. Sarah was the daughter of Allan Wiley and Sarah Adams. They had seven children: John, Joseph, Mary, Thomas, Martha (Mary), Margaret, and William. Those are the names as I have them, not documented. It does seem strange that Martha would go by Mary when she had a sister by that name. Neither of them died young.