A word of warning: there were two William Warnocks. (1) the William mentioned here, b. 1745, Ulster, Down, who did not emigrate, (though some of his descendants did) and (2) my ancestor William James Warnock b. 1746, Ulster, Tyrone, who emigrated before 1776 and settled in the area which became Greenup Co. KY. Some researchers for both lines have intermingled these families, and it is easy to go astray (as did I when I first started) so be aware that there are still some of these mixed records floating around out there. Linda Miller, (desc. of William b. 1745), and Laken Guinn Warnock & Jerry Wear, (desc. of William James), helped me "untangle" my records..
William James m. Elizabeth Carlisle; their four children, all b. KY, were Samuel Laken b. 1776, James b. 1781, George Johnson b. 1782 & William J. (birthdate unk.). Research in Ireland by three generations of descendants has failed to trace William James' ancestry. Hugh is not a family name in this line. Virginia