Mercury (Latin: Mercurius) is a major Roman God, being one of the Dii Consentes within the ancient Roman pantheon. He is the patron god of financial gain, commerce, eloquence (and thus poetry), messages/communication (including divination), travelers, boundaries, luck.
His name is possibly related to the Latin word merx ("merchandise"; compare merchant, commerce, etc.), mercari (to trade), and merces (wages); another possible connection is the Proto-Indo-European root merĝ- for "boundary, border, as the "keeper of boundaries," referring to his role as bridge between the upper and lower worlds.