Especially since Sicilians have italian names. For instance, someone can have the last name calogero and be from Sicily while someone else can have that same last name and be from Torino.
I'm sure you meant Calogero as a first name, not last.
And I'm going to disagree with you on this. First names in Italy and Sicily are just as regional as last names are. You can tell where a person is from many times just by their first name.
For instance, Giancarlo is a northern name, not very common at all in sicily. The member here Giancarlo would tell you this, but that's not his real name.
