History of the Early Settlement of Bridgewater, in Plymouth County, Massachusetts [Including an Extensive Family Register] by Nahum Mitchell on page 197 explains the different spellings of "Hayward", "Haward" and "Howard" here in the States. John Howard settled in Duxbury and removed to West Bridgewater a. 1651 He spelled his name Haward, but it seems after 1700 his descendants started spelling it Howard. (That seems to be how it was pronounced) Thomas Hayward settled in Duxbury before 1638 and removed to Bridgewater. My family has always spelled it Hayward from Thomas Hayward (came from England and died in Bridgewater, Plymouth, MA in 1681. I have not gone further back than him.