Illy

You think I am dumb? You just removed the first letter of your name. Don't think I am Stupid. Your name either is Billy, Filly, Gilly, Hilly, Jilly, Lilly, Milly, Tilly, Zilly.

Hi I am Ill (Billy, Filly, Gilly, Hilly, Jilly, Lilly, Milly, Tilly, Zilly.) (I am not stupid.)