It means you can't have any fairy tales without villains. "Beauty and the Beast" is right out. "Rumpelstiltskin" passes muster, but "The Three Aunts" not (unless you make the queen mother a villain, and there you face the little problem that she's painted herself into a corner and can't triumph).
Meanwhile, I'm looking at generating twenty-four names. Twelve apiece for the princesses and the men they marry of "The Twelve Dancing Princesses." Fortunately, they will fall out of the story, quickly, so maybe I can just have three or four and have the heroine lose track before she starts to ponder what she's begun.