In Act III, we learn that Jack's real name is Ernest John Moncrieff and that he was found in a hand-bag at a train station when he was a baby. He was then adopted by Thomas Cardew and raised as his brother with Cecily. This information reveals that Jack's true identity and background are not what he has led others to believe, as he has been posing as Ernest Worthing. It also explains his mysterious origins and adds an element of surprise and humor to the plot.
