This article argues that there is no evidence for the maiden name of Mary who married Thomas Griswold 28 Nov 1672, and that she is unlikely to be "Mary (dau. Henry) Howard" as stated by Henry R. Stiles in History of Ancient Wethersfield, possibly based on Savage's Genealogical Dictionary.
'MARY HAYWARD [daughter of Henry Hayward] ... almost certainly was not the "Mary ____" who married at Wethersfield on 28 November 1672 Thomas Griswold [WetVR Barbour 141, citing "LR 2:10"; TAG 36:200].'