I neglected to say in my earlier message that this comes from Massachusetts Vital Records Leicester 1706-1891
Publications by Jay Mack Holbrook
This same database has the birth of Tamison Denny, 16 September 1760 to Thomas and Mary Denny [sorry no maiden name] Also, Mary's name was added later. Originally it was left blank, but no way to tell when it was added.
I also found a marriage record of a Thomas Denny of Leceister to Mary Stowers of Pomfret 28 August 1755 in these Leister records.