plebeian. If Postumus or Postumius Cominius Auruncus, consul in B. C. 501, belonged to this gens, it must have been patrician originally; but it is probable that he was a member of the Postumia gens, as Valerius Maximus (de Nom. Rat.) mentions him as an instance in which the praenomens and cognomens are confounded in the consular Fasti. Cominius also occurs as a cognomen of the Pontii. (See below.) None of the members of the Cominia gens obtained any of the higher offices of the state. [COMINIUS.]
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890