The 24-year-old former model from Essex made the admission on tonight's episode of The Xtra Factor (November 10).
Asked by presenters Caroline Flack and Olly Murs whether the information was correct, he admitted that Rylan is a stage name that he adopted when he started his modelling career.
He said: "It's true! Who's Rylan? I don't know."
He added that his full name was Ross Richard Clark, before Flack and Murs revealed an image of his passport verifying the information.
Clark then commented that he looked like a criminal in the passport photograph.
Speaking on the ITV2 show, Clark also admitted that he believed he has "outstayed his welcome" and that he thought he would be leaving the singing competition in week one.