Is this family related to the Patrick Burnes/Burness [aka Byrns/Byrnes/Byrne] who emigrated to Maryland from Scotland in the early 1700's? Patrick died and left a will in St. Mary's Co. MD in 1737 naming his sons: Denis [m 2nd. Martha Holton]; James [m. 2nd Eleanor Miles and had sons John, James and likely others]; Michael [m. Priscilla Miles]had son Michael Jr. and daughter Ann; Patrick Jr., and Mathias who may have moved to Montgomery Co, MD which borders on the DC area. Patrick also had a daughter Catherine who married Solomon Jones. Patrick was the son of John Burnes/Burness and Agnes McMillan of Kincardine, Ayrshire, Scotland. John was the son of Walter Burness and Isobell Grieg/Gregg.
I believe that I've seen postings suggesting that one of Patrick's brothers also emigrated to Maryland with him. I know more about the line of his son Denis than the others. Denis died in 1750 and left a will naming his wife Martha, sons Denis Jr., Ignatius, Benedict/Bennet and Nicholas. Denis Jr. died between 1771 and 1778 - he married Mary Jones. His will named son Frederick and daughter Ann. Nicholas took the oath of fidelity to Maryland in 1777 in St. Mary's co.. Ignatius and a Patrick Byrnes moved to Loudoun Co. VA in the late 1770's or before. They also appear on some Montgomery Co MD records I believe, but need to check. Bennet/Benedict married Epta/Eptha Stillwell in Berkeley Co VA so also appeared to move that way. Ignatius had, supposedly, sons Simon, Laughlin, Ignatius Jr., and others. Ignatius and descendants mostly went to Kentucky. All of this family was Catholic.