Nomen Gentilicium

(Latin) the name of the gens; the family name; other parts of the Roman name were the praenomen (the first name) and the cognomen (the particular branch of the nomen gentilicium); for example, for Gaius Julius Caesar, Gaius is the praenomen, Julius is the nomen gentilicium, and Caesar is the cognomen and his descendants are known as the Julii.
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