Harry decides that he doesn't want to deal with the fame that comes with his name. He changes his name to something else.
He inadvertently chooses the one name that would freak Dumbledore out the most.
"Riddle, Hadrian!"
"This is mad. There's only a week left and we still don't have dates."
"Not unless we go together." The words were out before Harry could stop them.
Fourth year AU