None, some people would hate to be called "Poliwos".
Chad Joel's birth name is Chad Christopher Joel.
Joel Wein's birth name is Joel Wein.
Joel Beckett's birth name is Joel Bygraves.
Joel Steed's birth name is Joel Edward Steed.
Phil Joel's birth name is Philip Joel Urry.
Joel Pineiro's birth name is Joel Alberto Pineiro.
Billy Joel's birth name is Joel, William Martin.
Joel Makovicka's birth name is Joel P. Makovicka.
Joel Solomon's birth name is Joel William Solomon.
Joel Someillan's birth name is Joel O. Someillan.
Joel Schumacher's birth name is Joel T. Schumacher.
Joel Rinne's birth name is Toivo Joel Grndahl.