The gens Numonia, occasionally written Nummonia, was a minor plebeian family at Rome.
The nomen Numonius belongs to a class of gentilicia ending in -onius, typical of plebeian gentes, or those of Oscan origin.
[1] As was often the case in imperial times, all of the individuals known from the family of the Valae bore the same praenomen, Gaius, as do most of the other Numonii mentioned in inscriptions.
However, a set of inscriptions from the ancient Etruscan city of Caere, likely among the oldest, as the individuals named have no cognomina, demonstrate that the Numonii also used Aulus and Lucius.
The only distinct family of the Numonia gens bore the surname Vala, also spelled Vaala, apparently obtained by an ancestor of the family who had stormed a vallum.