Joel - Sickboy

Benji - Kid Vicious

Billy - Lil Billy

Paul - St. Paul

Full names:

Benjamin Levi Madden

Joel Rueben Madden

Paul Thomas

William (Billy) Martin

Joel and Benji's last name used to be Combs, but cuz their dad left they changed it to Madden... Their mom's maidn name and its tatooed on Joel.