I’ve got some familiarity with controversial family legends. Mine, through my mother’s family, says that we descend from Opechancanough due to his raping Mary Sizemore during the Second Anglo-Powhatan War in Jamestown. I suppose it could only possibly be confirmed through male descendants, though, much like this. I don’t doubt that they descent from “a” Jefferson, but I strongly doubt that they descend from Thomas Jefferson.
Well, Opechancanough’s name does roughly translate into ‘He whose Soul is White.’