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In page Roman naming conventions:

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A similar pattern was followed by Augustus' heirs. The emperor's stepson and eventual successor was born Tiberius Claudius Nero; after his adoption by the emperor, he became Tiberius Julius Caesar (retaining his original praenomen). His brother, born Decimus Claudius Nero, subsequently became Nero Claudius Drusus, exchanging his original praenomen for his paternal cognomen, and assuming a new cognomen from his maternal grandfather. Other members of the Julio-Claudian dynasty used praenomina such as Drusus and Germanicus.[citation needed]