Recent discoveries proved William Harris married Susan Hyde of London.

See: Hydes of England: Ancestors of Thomas Olcott of Connecticut, Samuel Hardy of Massachusetts, and Susan Hyde, Wife of William Harris of Rhode Island," by Frederick J. Nicholson, in The Genealogist, Vol. 20 (2006), No. 2, pages 131-83.

Also see the following link:

http://kinnexions.com/smlawson/olcott.htm