I think the Isles name came in with Elizabeth. Have seen the marriage to Martha Isles quoted many times, but no one has been able to give documentation. I have numerous court records connecting Thomas Isles and Elizabeth Wardley to their daughters Katherine and Elizabeth, then Isles Cooper and his father Samuel Cooper to the estate of Elizabeth. I have not found a divorce record for Isles Cooper and wife, but have a deed showing an Elizabeth as wife in 1715/16, then he married Susannah about 1717. They had one son, and he left about 1720. She claimed he had two wives after that. Second one may have been Sarah, widow of William Wilson, who was his wife when he died. Let me know if there are any records you would like.