There are various names mentioned for the step-sisters; they vary from version to version. I've heard the step-sisters be named Claudette and Javotte, Marguerite and Jacqueline (Ever After), Anastacia and Druscilla (Disney's "Cinderella"), Calliope and Minerva (the 1997 Rodgers and Hammerstein's "Cinderella"), Prunella and Esmerelda (the 1964 Rodgers and Hammerstein's "Cinderella"), etc. In one version (though I can't remember which one) Cinderella's real name is Ella.