"The Letchworth Family in England and America," Compiled by Edward Hance Letchworth, Buffalo, NY, 1940, 144 Pgs.,Illustrated, Index, Family Tree, hb. (Quaker, Society of Friends, parish population about 200), covering 1332-1930's, 103 family surnames in U.S., 17 family surnames in England. 8 generations. Letchworth is between Hilchen and Baldoch in Hertfordshire. Listed in Doomsday Book. Now pastureland. I will look up family information for you in this wonderful reference. Many other corollary surnames listed also.