My Grandmother was also a Stanfill. She was the Daughter of Thomas Monroe Stanfill ( also born in Tenn ) and Hannah Emmaline Bess. The Records, that I show for Thomas, list His Last Name as both " Stanfill " and " Standfield " I saw a Posting, of His Obit, and even that Lists, His last Name as " Standfield ". I know that is not correct. Since all Written Information, would have been taken, Verbally, back then, I can see how, there might have been a Misspelling, in the Name. I would check out the " Standfield " spelling also. I saw no other connection, in the Names You listed and the ones, I have.
Good Luck in Your Search.