A courting couple who were employed by the 6th Duke of Portland went for a stroll across the moorland. The girl's mother disapproved of her daughter's relationship with the young man and would follow at a safe distance. The young man thought he would have a look to see if there was any sign of the girl's mother around, saw her grey head to which he exclaimed, "Damn that Grey Hen" and so this is supposed to be the origin of the name.
It was told to Mrs I. Patterson in 1959 who was aged 92 then.
Also the well is famed for never having run dry.
Source: Joy Corley,Welbeck Estate Office, Berriedale