No response at his profile, so moving this question here in hopes of more interest:
On 21 May 2023 Ashley Jones JD wrote on Welborn-98:
William's great granddaughter, Susan Beatrice Wellborn Blackmar, my 2nd great grandmother, shared a family tree with the Atlanta Constitution for publication in 1910. (here, if you have a newspapers.com subscription.) In that tree, she named William's father as a Samuel Wellborn (Welbourne-79), of Accomac County, Virginia, son of Captain Thomas Wellborn, son of John Wellborn (a missing generation here on wikitree), son of another John Wellborn (Welbourne-81), a Welchman who came to Jamestown.
Obviously, her account of her great grandfather's family is different from what we have here. Some research is needed to confirm or disprove the details of her tree, but William's parents are pretty sparsely sourced at the moment. I've spent some time trying to source the connections, without much success. Any thoughts?
FYI, this 1953 book on the Welborn family gives the same line of descent, from John Wellborn down to this William, who married Hepzibah Starnes. It identifies his mother as one Mary Chapley, which would explain why he and subsequent generations named sons Chapley. It's a very unusual name, and one which does not appear in the Maryland Wellborn or Crabtree families.
The lineage is credited to the work of Lodowick Johnson Hill, who married Martha Wellborn, William's granddaughter by his son, Abner.
I've searched and found nothing to discredit the two women's accounts of their own grandfather and great grandfather, other than a few dismissive "some little old ladies showed up at a family reunion with this wacky story" comments. Does anyone have anything more substantial for William's parents, one way or the other?