Cernunnos is the conventional name given in Celtic studies to depictions of the "horned god" of Celtic polytheism. Cernunnos was a Celtic god of fertility, life, animals, wealth, and the underworld. The name itself is only attested once, on the 1st-century Pillar of the Boatmen, but he appears all over Gaul, and among the Celtiberians. Cernunnos is depicted with the antlers of a stag, sometimes carries a purse filled with coin, often seated cross-legged and often associated with animals and holding or wearing torcs, are known from over 50 examples in the Gallo-Roman period, mostly in north-eastern Gaul.
Not much is known about the god from literary sources, and details about his name, his followers or his significance in Celtic religion are unknown. Speculative interpretations identify him as a god of nature, life or fertility.
The theonym [C]ernunnos appears on the Pillar of the Boatmen, a Gallo-Roman monument dating to the early 1st century CE, to label a god depicted with stag's antlers in their early stage of annual growth. Both antlers have torcs hanging from them.
The name has been compared to a divine epithet Carnonos in a Celtic inscription written in Greek characters at Montagnac, Hérault (as καρνονου, karnonou, in the dative case). A Gallo-Latin adjective carnuātus, "horned," is also found.
The Proto-Celtic form of the theonym is reconstructed as either *Cerno-on-os or *Carno-on-os. The augmentative -on- is characteristic of theonyms, as in Maponos, Epona, Matronae, and Sirona. Maier (2010) states that the etymology of Cernunnos is unknown, as the Celtic word for "horn" has an a (as in Carnonos).