William St. Quintin had, by Beatrix, his wife, a son, Herbert, Baron of St. Quintin. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 469, St. Quintin, Baron St. Quintin]
Sir William, lord of St. Quintin, m. Beatrix, daughter of Saire, Lord Sutton, of Holderness, and from him descended the Barons St. Quintin. [John Burke & John Bernard Burke, Extinct and Dormant Baronetcies of England, Ireland, and Scotland, Second Edition, Scott, Webster, & Geary, London, 1841, p. 463, St. Quintin, of Harpham]