Wikipedia
Numerius is a Latin praenomen, or personal name, usually abbreviated N. The name was never especially common, but was used throughout the period of the Roman Republic, and into imperial times. The feminine form is Numeria. The praenomen also gave rise to the patronymic gens Numeria.
Although Numerius was occasionally used by patrician gentes, such as the Furii and the Valerii, the only patrician family to use the name regularly was gens Fabia. Festus relates the story of how Numerius was introduced to the family after a survivor of the battle of the Cremera married a daughter of Numerius Otacilius Maleventanus. The name was used more widely amongst the plebeians and in the countryside, and was relatively common in southern Italy.