You said it best yourself Ethereal, it is just alleged.

You can't confuse people for being related to organised crime because of a name. Take the microsoft empire as an example. Bill Gates, the boss and his Family are made up of all people of different names. Who ever's good for the job. Ok maybe he might have helped a few family members join his business so there may be other Gates' in Microsoft (don't know if this is true though). But you find someone with the surname Gates, more probable than not, they're not related to the little guy by blood or by business.

The same goes with the Lucchese. Tommy maybe had a few relatives associated with the Mafia. But the Family is made up of hundreds of people with different names.