I bought a book that provided some info but not Stephen Lock's spouse's name.The book suggests that it could be Mary, possible dau of William Johnston. "Two Bladen deeds may provide a clue to her family, Bladen Deed Book 12 pages 519 and 520." "Deeds dated 25 May 1816 represent a change of property between Stephen Lock and William Johnston."This information comes from pg 120 of the book Leonard Lock, ca. 1658-1711 and Descendants by Dr. J.R. Peacock, 1998, Rose Printing Co, Tallahassee.