Possible Clues:

• Marciano's real first name
• Boxer Marciano's given name
• Visconti's '-- and His Brothers'
• 'Fidelio' basso
• ''Fidelio'' jailer
• Boxer Marciano's birth name
• Johnny --, character played by Edward G. Robinson in 'Key Largo'
• Marciano's birth name
• Boxer Graziano, formally
• Son of Madonna and Guy Ritchie