"Mauger, probably a grandson of the Doomsday tenant, is the earliest found with the surname 'le Vavasur'; he was a benefactor to Salley Abbey, and died in 1168.[Yorks. Arch. Journal, vol. 5, p. 314] He was succeeded by his son, William, a Justice Itinerant at the end of the reign of Henry II; another son, Richard, ... " 
Sir Mauger le Vavasor had issue Sir William Vavasor, of Hazlewood.  
 W. Paley Blaidon, Baildon and the Baildons, A History of a Yorkshire Manor and Family, Vol. 1 (St. Catherine's Press, 1912), 505, [InternetArchive].
 J.W. Clay, ed., Dugdale's Visitation of Yorkshire, with Additions, Vol. 2 (Exeter: William Pollard & Co., 1907), 224, [InternetArchive].
 J. W. Clay, "Dugdale's Visitation of Yorkshire, with additions," The Genealogist a Quarterly Magazine of Genealogical, Antiquarian, Topographical, and Heraldic Research, New Series, 19 (1903), 36, 112, 190, 248, at 112, [HathiTrust].