I showed that map/name location search to Italian friends and they put their last names in and they said it was very inaccurate. Also names that end in vowels are not always Italian as they can be Spanish, or from Latin America.
It's largely a myth that in order to be "made" or join la famiglia you must be fully Italian on both sides of your family. Sometimes people get in because of Italian heritage from a certain region passed on from generations ago as they're born into it and they do not have an Italian last name.
They said that Pistone is a Sicilian last name and that's Donnie Brasco's actual name, and apparently he was not adopted.
Could a person from Argentina or South America be made in the mob. Argentine people mostly have Italian last names and other south American countries?
Possibly they could join IOC factions in those countries if they were foolish enough to want to do this and had a death wish.
