His full name was "William", he had no other name since he was born a bastard.
Langevin
William The Bastard, he was illegitimate.
Tim Burton's full birth name is Timothy William Burton.
He didn't have a second name; since he was born a bastard.
Williams the conquerors wife was called Anabelle
His full name is Louis William Tomlinson, his birth name was Louis Troy Austin.
William Lanteau's birth name is William Lanctot.
William Sheller's birth name is William Hand.
William Robyns's birth name is William Robins.
William Roerick's birth name is William Roehrich.
William Dalphin's birth name is William Dalphin.
William Brisbane's birth name is William Brisben.