Noun
An additional or fourth name given by the Romans, on account of some remarkable exploit or event; as, Publius Caius Scipio Africanus.
An additional name, or an epithet appended to a name; as, Aristides the Just.
Source: Webster's dictionaryAlso unclear is what role Nepos' ties of kinship with Marcellinus might have played in the acquisition of his agnomen. Source: Internet
"Merlinus" may have been intended as the agnomen of a Roman or Romano-British individual like Ambrosius. Source: Internet
Ironically, the most famous examples of this class of cognomen come from the period of the Republic, centuries before the concept of the agnomen was formulated. Source: Internet
MacGeorge (2002), p42 Although the association of the agnomen "Nepos" with his connection to the Leonid dynasty seems to be fairly clear, the origins of and relationships between all these similar-sounding names, including his father's, are less clear. Source: Internet
Nepos was married to Leo's niece, hence his agnomen of nepos — "nephew". Source: Internet
Thus far, his name follows the Republican model, becoming that of his adoptive father, followed by his original nomen in the form of an agnomen. Source: Internet