One begins to wonder if, 150 or so years from now, people will be scratching their heads and trying to figure out just exactly who "Suzie Q" or "Mary Ann" was; they'll be saying, "She surely must have been somebody, with all those singers singing about her for many decades." :)
Who was Abner is a good question and fun to think about; but my money is on "nobody will ever know".
Pen (who still adores the version of Suzie Q put out by CCR)