In Gallo-Roman religion, Arvernus was an epithet of the Gaulish Mercury. Although the name refers to the Arverni, in whose territory Mercury had at important sanctuary at the Puy-de-Dôme, all of the inscriptions to Mercury Arvernus are found farther away along the Rhenish frontier. The name is also recorded once as Mercury Arvernorix, 'king of the Arverni'. Compare also the title Mercury Dumiatis ('of the Puy-de-Dôme'), found in the territory of the Arverni. The name, like the name of the Arverni and of Auvergne, appears to derive from a Proto-Celticcompoundadjective *φara-werno-s ‘in front of alders.’
^Nicole Jufer & Thierry Luginbühl (2001). Les dieux gaulois : répertoire des noms de divinités celtiques connus par l'épigraphie, les textes antiques et la toponymie. Paris: Editions Errance. ISBN 2-87772-200-7.