No one really knows, but a tomb in a church was found with the inscription leonardus vinci.
Leonardo Corbucci goes by Leonardo Corbucci Zanobi.
Jose Leonardo Suarez goes by Leonardo Suarez.
Leonardo Sessa goes by Lee.
Leonardo Domingues goes by Leo.
Leonardo Cabezas goes by Leo.
Leonardo Carrera goes by Damian.
Leonardo Nam goes by Leo.
Leonardo Miggiorin goes by Lo.
Cesar Leonardo goes by Chino.
Leonardo Figueroa goes by Leonocity.
Leonardo Thierry goes by Leo.
Leonardo Sbaraglia goes by Leo.