Bartholomew de Boynton
Bartholomew de Boynton, the first of the name, said to have been lord of the manor of Boynton in 1067 and the man the surname comes from. The village sits in the Wolds a few miles from Bridlington and the North Sea, and the family held it for centuries before selling out and moving to Barmston and then Burton Agnes.
That 1067 is the only date anybody puts on him, but it is a claim about a manor rather than a record of a birth, and it does not survive contact with Domesday. The survey of 1086 lists Boynton three times over. Earl Morcar held one part before the Conquest and King William held it after. Arnketil, Cnut son of Karli and Ulf held the second, and the king took that too. Thorkil held the third, and by 1086 it had passed to Richard of Sourdeval under Count Robert of Mortain. No Bartholomew appears anywhere in it, and neither does anybody called Boynton.
Betham's editor saw the same problem and footnoted his own text: "This must be a mistake, as one Torchill possessed it at that period, as appears by Doomsday-Book." His way out is that the Boyntons held land at Boynton without holding the manor. That is a guess offered to rescue a date. Two generations down, Sir Ingram is the first man in this line named on a document outside the family's own papers.
Sources
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Cite: Heirology, "Bartholomew de Boynton (b. 1067)", https://heirology.com/ancestors/bartholomew-de-boynton-1067-9a329d.