Thank you for your useful comment. I am glad someone else is trying to sort out the Bryans! Randy Bryan might be a good source of information on which YDNA results are linked to Morgan Bryan.
I am the source of some of the information in your posting but feel a bit lost by the references used to kit numbers. Just to clarify, my branch of Bryans (my mother's paternal line) is represented by FTDNA test kit 212555, a test I sponsored of my first cousin, Ross McKay Bryan. I am unfamiliar with the numbers you use to refer to this kit (YVXUD and C76AH) and would appreciate an explanation of them. I am familiar with the pedigrees of three of Ross's matches that you mention (FTDNA kits 227323, 61987, 125666) but not others. I also would appreciate some help from an expert in sorting out the results. As you state, Ross and I have a solid pedigree back to our third great grandparents William Bryan b. 1762 in Virginia and d. 1823 in Kentucky, who married Ann Hundley (1765-1826) in Amelia County, Virginia, in 1785. The identity of William's parents has been a family mystery but, on the basis of family Bible records (showing Halifax Virginia as birthplace of my GG grandfather Dr. William Bryan) and early 1790s tax records showing a William in Halifax County, Virginia, at the same time as a John Bryan Sr and a John Bryan Jr., I feel on relatively solid ground in postulating that a John Bryan who died in Halifax Virginia in 1799 is the father of my William b. 1762. I have recently theorized that the ancestry of these individuals lie with the branch of Bryans who migrated from Isle of Wight/Nansemond Virginia to Bertie, North Carolina in c 1720s. These are the Bryans that include the various Needham Bryans. My line is as follows: EDWARD BRYANT (1565 - 1630) is (I believe!) my 9th great grandfather EDWARD BRYANT(1590 - 1660) Son of EDWARD BRYANT JOHN BRYAN (1610 - 1680) Son of EDWARD BRYANT WILLIAM BRYAN (1655 - 1742) Son of JOHN BRYAN WILLIAM BRYAN (1692 - 1744) Son of WILLIAM BRYAN JOHN BRYAN (1731 - 1799) Son of WILLIAM BRYAN WILLIAM BRYAN (1762 - 1823) Son of JOHN BRYAN WILLIAM BRYAN MD (1791 - 1871) Son of WILLIAM BRYAN MD CHARLES BRYAN (1849 - 1924) Son of WILLIAMBRYAN LUDWELL McKAY BRYAN (1875 - 1957) Son of CHARLES BRYAN MARCIA URTON BRYAN (1916 - 2007) Daughter of LUDWELL McKAYBRYAN Linda Rae Horton, daughter of MARCIA.