An author named Stephen Hawley Martin was descended from Susannah North Martin and lives in Virginia. He has written a book entitled "A Witch in the Family" and you may find some information in there. If you knew which line traced back to there then maybe you could find out more information. I think you could go ahead and e-mail Stephen at his publishing company. His e-mail address is www.OakleaPress.com He may know of a connection. Do you think it's Susannah you descended from?
Good luck.