The gens Aternia, also written Aeternia, was a patrician family at ancient Rome. The only member of this gens to appear in history was Aulus Aternius Varus, consul in 454 BC, and later one of the only patricians ever to be chosen tribune of the plebs. Other Aternii are known from inscriptions.[1]
The only surnames of the Aternii in Republican times are Varus and Fontinalis. Varus belongs to a large class of cognomina originally derived from the physical characteristics of the bearer, and indicated someone "knock-kneed"; that is, with inwardly-turned legs.[2]Fontinalis is derived from fons, and must have indicated someone who lived near a spring; it belongs to a common class of surname derived from the names of everyday objects.[3]