 Archibald Cary was the son of Wilson Jefferson Cary and Virginia Randolph.Wilson Jefferson Cary was a descendant of the ancient and prominent English gentry family of Cary, lords of the manor of Clovelly in Devon and of Cockington and Tor Abbey, as is related in a genealogical work by Fairfax Harrison (1869-1938) of Belvoir House, Fauquier County, Virginia (son of Constance Cary Harrison) "The Devon Carys", 2 vols., New York, 1920.Monimia Fairfax was the daughter of Thomas Fairfax, 9th Lord Fairfax of Cameron, and Margaret Herbert who was the granddaughter of John Carlyle and Sarah Fairfax.