The gens Alliena or Aliena was a minor plebeian family of the Roman Republic.
The first member of the gens to achieve prominence was Lucius Alienus, plebeian aedile in 454 BC.
[2] As a personal cognomen in the Etruscan gens Caecinia, it may have been derived from the adjective.
The main praenomina of the Allieni were Aulus, Gaius, Lucius, and Manius, of which the first three were common throughout all periods of Roman history, although Manius was more distinctive, favored by some families and avoided by most others, perhaps due to confusion with the Manes, the spirits of the dead.
Spurius, although it occurs in two filiations of this gens, probably does not represent the praenomen, which was falling out of use by the first century, but indicates that their fathers were unknown; as with Manius, this usage seems to be the result of confusion between the name and an unrelated word, spurius, meaning "illegitimate".