The agnomen (plural agnomina) formed an additional part of some Roman names, usually following the cognomen. Usually they were nicknames acquired at some point during the lifetime, but, rarely, some agnomina were inherited.

Some examples of agnomina are given in the following table.

Africanusgeneral Publius Cornelius Scipio Africanus
Hadrianusemperor Publius Aelius Traianus Hadrianus (Hadrian)
Traianusemperor Marcus Ulpius Nerva Traianus (Trajan)