I have information that our immigrant Blair ancestor, William Blair, came to York Co. in 1765 and married Sarah Suter, daughter of George Suter of York. William served in the Revolutionary War. He came to the U.S. with two brothers. One was named James and he settled in Charlotte, N.C. The other is unknown. There is a gap between William and John Francis Blair who was born in 1804, and lived in Pittsylvania Co., Virginia. Does this tie in with your Blairs at all?