Cognomen

Definition and stakes

Portrait of Charlotte M. Yonge Charlotte M. Yonge,  History of Christian names (1884)

“ The daughters of the gens were called by the feminine of its name, and sometimes took that of the gens of their husband, but this was not always the custom.
Besides these large tribes, there were lesser ones of families. If an ancestor had acquired an additional appellation, whether honourable or ludicrous, it passed to all his male descendants, thus distinguishing them from the rest of their gens, and was called the cognomen. For instance, after Marcus Manlius had saved the capitol, Capitolinus would be the cognomen not merely of himself but of his posterity.
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Source: Gutenberg

Portrait of William Smith William Smith,  A Smaller Dictionary of Greek and Roman Antiquities

“ Every Roman citizen, besides belonging to a gens, was also frequently a member of a familia, contained in a gens, and accordingly might have a third name or cognomen. Such cognomina were derived by the Romans from a variety of mental or bodily peculiarities, or from some remarkable event in the life of the person who was the founder of the familia. Such cognomina are, Asper, Imperiosus, Magnus, Maximus, Publicola, Brutus, Capito, Cato, Naso, Labeo, Caecus, Cicero, Scipio, Sulla, Torquatus, &c. ”
Source: Gutenberg

Portrait of Charlotte M. Yonge Charlotte M. Yonge,  History of Christian names (1884)

“ There was a very small choice of Roman prænomina, not above seventeen; an initial was sufficient to indicate which might be intended, nor did ladies receive their feminines in the earlier times. By which name a man might be called was arbitrary; the gentile name was the distinction of rank, and perhaps the most commonly used by his acquaintance, unless the tribe were very large, when the cognomen would be used; and among brothers the prænomen was brought in first as the Christian name is with us. ”
Source: Gutenberg

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