Axius is the nomen of the Roman gens Axia. Axius may also refer to: In geography, In mythology, In biology, ...[decapod] Axius is a genus of mud lobster, containing the following species: ...[mythology] Axius (Greek: Ἀξιός) is a Paeonian river god, the son of Oceanus and Tethys. He was the father of Pelagon, by Periboea, daughter of Acessamenus. His domain is the river Axius, or Vardar, in Macedonia (region). ...