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Globally, Tullius (Tullio , Tullius , Туллий ) is a common male first name. The first name Tullius is habitual in Italy, where it is quite a common masculine name, Croatia, where it is a rare boy's name, and Brazil. In absolute terms, the name is most common in Italy, Brazil, and France. Much less frequently, Tullius is the last name as well as the forename.
Tullius is also a name for the fictitious and mythical characters: Tullius Detritus , character in Asterix and Tullio , the operatic character in the opera Arminio (Händel).