Nero Claudius Drusus
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".