My guess is that Puzo named her Carmela when he was developing the character. Even though it never made it into the novel or movie, it was her name in the script and, therefore, known to the cast and crew and eventually made its way into public view.
That's probably true, Woltz. We know that Roth's wife's name is Marcia, and the bodyguard's name is Buscetta, only from the script. They weren't named in the movie.
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.
