The only information I have is
Thomas Kirk born abt 1758. He married a Nancy Webb (born abt 1767) on 15 Dec 1787 in Montgomery, Virginia. He died in 1821 in Giles Co., Va. His parents were John Kirk born abt 1725, died in 1788 in Culpepper Co., and Margaret (Brooks?) who died aft 1787.
This is all the information I have on that line. Thomas Kirk's daughter, Sarah, was married to my ggggrandfather Landon Duncan. Landon's mother married Thomas Kirk in their later years.
Hope this helps.