...nomen est, quod uni cuique personae datur, quo suo quaeque proprio et certo vocabulo appellatur. –
Cicero De inventione 1.24
Roman naming practices varied greatly over the centuries from the founding of Rome to the early Middle Ages. However, the practice of the elite during the period between the mid-Republic and the early Empire has come to be seen as the classical Roman naming convention. This is likely to be because this period provides good evidence of naming practices of the best documented class in the best documented Roman period.
By the end of the Republican era, a name for an aristocratic male citizen comprised three parts (tria nomina): praenomen (given name), nomen (or nomen gentile or simply gentilicium, being the name of the gens or clan) and cognomen (name of a family line within the gens). Sometimes a second or third cognomen, called agnomen, was added. The nomen, and later, cognomen were virtually always hereditary. During the Imperial period, the number and options for elements within a name considerably increased. The naming conventions for the later period grew out of a desire to indicate status, connections and ancestry, in a way that was much more wide-ranging than could be shown by the tria nomina.
During the Empire, superficially the naming conventions appear to dissolve into anarchy. In fact, this was not the case as new conventions developed, which were themselves internally coherent. A wide range of naming models developed.
Females were officially known by the feminine form of their father's nomen gentile, followed by the genitive case of their father's (husband's if married) cognomen and an indication of order among sisters. By the late Roman Republic, women sometimes also adopted the feminine of their father's cognomen. A woman usually did not have the praenomen and agnomen, unless the parents chose to give her those.
The second name, or nomen gentile (usually simply nomen), rarely gentilicium, is the name of the gens (the family clan), in masculine form for men. The original gentes were descended from the family groups that settled Rome. These eventually developed into entire clans, which covered specific geographic regions. As the area of Rome expanded, the number of tribes also expanded. This meant that not all tribes were from original settlers. Some were named for Etruscan or Sabine families, while others were from local tribes or from major geographical features, such as rivers. Well-known nomina include many of the familiar names of ancient Rome, such as Aemilius, Claudius, Cornelius, Domitius, Julius, Junius, Pompeius, Antonius, Didius and Valerius.
The third name, or cognomen, began as a nickname or personal name that distinguished individuals with the same names. Cognomina do not appear in official documents until around 100 BC. Often the cognomen was chosen based on some physical or personality trait, sometimes with ironic results: Julius Caesar's cognomen, in one interpretation, meant hairy (cf. etymology of the name of Julius Caesar) although he was balding, and Tacitus' cognomen meant silent, while he was a well-known orator. However, from the Republican era, many cognomina were no longer nicknames, but instead were passed from father to son, serving to distinguish a family within a gens (and frequently requiring an agnomen to distinguish people of the same family if they shared praenomen as well as nomen and cognomen). Some males had a cognomen that ends in -anus, which was adapted from and commemorated a nomen, sometimes their maternal family or—if they were adopted—their original paternal family. For instance, Vespasian's nomen (Flavius) came from his father's nomen. His cognomen (Vespasianus), on the other hand, was derived from his mother's nomen, Vespasia. Others had cognomina that were derived not from the nomen, but the cognomen of their mothers' families. For instance, Caracalla's maternal grandfather was Julius Bassianus, but Caracalla's cognomen was not Julianus, but rather Bassianus as well.
To these a fourth name, or agnomen, was sometimes added, either on account of adoption, or in reward of some great exploit, and even for some personal defect or peculiarity. For example, Publius Cornelius Scipio, for his conquests was conferred the agnomen, or additional appellative, Africanus. When a man was adopted into another family, he would take on his adoptive father's names (excluding the praenomen). If he chose to, he could turn his original nomen into an additional cognomen that followed his newly gained names. For example, Publius Cornelius Scipio Aemilianus was adopted into the Cornelii Scipiones, but was born an Aemilius. Not all adoptees chose to identify their birth families. For instance, as an adult, Augustus did not use his cognomen Octavianus (shortened to Octavian), since the gens Octavia was not nearly as esteemed as the Julii.
In the early centuries of the Roman Republic, about three dozen praenomina seem to have been in general use at Rome, of which about half were common. This number gradually dwindled to about eighteen praenomina by the 1st century B.C., of which perhaps a dozen were common. So, they could generally be identified by initials or abbreviations alone: C = Gaius, Cn = Gnaeus, L = Lucius, M = Marcus, T = Titus, Ti = Tiberius etc. C. & Cn. were used for Gaius/Gnaeus because their use as
abbreviations predated the addition of the letter G to the alphabet. F and N are patronymics, F, filius, for "son of" N, nepos for "grandson of."
Manius (Mn. or Man.)
Nonus (a rare name which means 9th and was sometimes used to name the 9th child)
Opiter (Op. or Opet.)
Spurius (S. or Sp.)
Son of (f. = filius)
Grandson of (n. = nepos)
M. Fannius C. f. = Marcus Fannius, son of Gaius.
Mn. Fonteius C. f. = Manius Fonteius, son of Gaius.
A. Postumius A. f. Sp. n. Albinus - Aulus Postumius Albinus, son of Aulus, grandson of Spurius.
Ti. Claudius Ti. f. Ap. n. Nero - Tiberius Claudius Nero, son of Tiberius, grandson of Appius.
L. C. Memmius L. f. Galeria - Lucius [and] Gaius Memmius Galeria, sons of Lucius.
Nonus - was never particularly common at Rome, but may have been used more frequently in the countryside. Although not attested in surviving Latin inscriptions, the name must have been used occasionally, as it gave rise to the patronymic gens Nonia. The feminine form is Nona. Nonus was probably not used frequently enough to acquire a regular abbreviation. Nonus is the Latin word for ninth, and the name must originally have been used for a ninth child, a ninth son, or a ninth daughter. It belongs to the same class of praenomina as the masculine names Quintus (5th), Sextus (6th), Septimus (7th), Octavius (8th), and Decimus (10th), as well as the feminine names Prima (1st), Secunda (2nd), Tertia (3rd), Quarta (4th), Quinta (5th), Sexta (6th), Septima (7th), Octavia (8th), and Decima (10th). However, it may also have been used for children who were born in November, the ninth month of the Roman calendar.
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An ancient grammarian, whose authority Eckhel quotes from Sigonius, thus succinctly defines the appellative words by which the heads of Roman families were distinguished, and which were of four kinds - viz., the Praenomen, which was prefixed to mark the difference in the ancestral name (Nomini getilitio): the Nomen, which was designed to show the origin of the gens or race: the Cognomen, which was subjoined to the ancestral names: and the Agnomen, which was an extrinsic designation constantly added, for some particular reason, or on account of some public incident. Valerius expresses himself of a similar opinion on these points.
By some writers even the agnomen was recognized as the cognomen or surname. "Of this an example," observes Eckhel, " is furnished to us in the case of L. Calpurnius Piso Frugi, by Cicero who distinctly points to and comments on, Frugi as the surname of Calpurnius Piso.--See Doct. Num. Vet. vol v. p. 56--See also Cognomen.
During the Republic, it was the sedulous care of the Romans to preserve and hand down their nomen gentilitium, the name which came to them by descent from their ancestors. The eldest son usually took the proper name of the father, as in Claudia, Fabia, and Cornelia families. Younger sons, it appears, assumed indifferently other names. During the Empire, attention to this rule was gradually relaxed. When the Emperor Caracalla granted citizenship to all subjects of the Empire, the ancient naming customs were entirely forgotten and everyone called himself whatever he pleased.