A cognomen (; : cognomina; from co- "together with" and (g)nomen "name") was the third name of a citizen of ancient Rome, under Roman naming conventions. Initially, it was a nickname, but lost that purpose when it became hereditary. Hereditary cognomina were used to augment the second name, the nomen gentilicium (the Surname, or clan name), in order to identify a particular branch within a family or family within a clan. The term has also taken on other contemporary meanings.
In contrast to the honorary cognomina adopted by successful generals, most cognomina were based on a physical or personality quirk; for example, Rufus meaning "red hair" or Mucia gens meaning "Left-handedness". Some cognomina were hereditary (such as Caesar among a branch of the Julia gens, Brutus and Silanus among the Junia gens, or Pilius and Metellus among the Caecilia gens): others tended to be individual. And some names appear to have been used both as praenomen, agnomen, or non-hereditary cognomen. For instance, Vopiscus was used as both praenomen and cognomen in the Julii Caesares; likewise Nero among the early imperial Claudia gens, several of whom used the traditional hereditary Claudian cognomen as a praenomen.
The upper-class usually used the cognomen to refer to one another.
In present academic context, many prominent ancient Romans are referred to by only their cognomen; for example, Cicero (from cicer "chickpea") serves as a shorthand for Marcus Tullius Cicero, and Caesar for Julius Caesar.
Catalan language cognom and Italian language cognome, derived from the Latin cognomen, mean "family name". Maltese language kunjom is derived from the Italian version and retains the same meaning.
The term "cognomen" can also be applied to cultures with a clan structure and naming conventions comparable to those of Ancient Rome; thus, hereditary "cognomina" have been described as in use among the Xhosa people (Iziduko), the Yoruba people (Oriki), and the Zulu people (Izibongo).
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