His name was Tom Riddle, but he went by Voldemort for most of his time attempting to destroy the world.
Look, I'm all for stopping him before he gains power, but I don't know if anything would actually be able to be changed. We'd need to find out how the magic here works first, as I'm from two years further along the timestream than Scorpius, but Scorpius is present when I come from. There is no way to make that sentence make sense.