Tullia (gens)
Gens Tullia was an Ancient Roman family. Tullius was its corresponding nomen. The feminine form was Tullia. Tully, especially as another name for Cicero, is an anglicized form now considered antiquated.
Not all those who have the nomen are related by blood; Cicero himself did not believe that he was descended from Servius Tullius, though at one point he referred to their shared gens.