“Mercurius” means herald of the gods

Mercurius: properly Hermes, the Greek deity, whom the Romans identified with their Mercury, the god of commerce and bargains. Hermes was the son of Zeus (Jupiter) and Maia the daughter of Atals, and is constantly represented as the companion of his father in his wandering upon earth. The episode of Baucis and Philemon, Ovid, Metam . viii. 620-724, appears to have formed part of the folk-lore of Asia Minor, and strikingly illustrates the readiness with which the simple people of Lystra recognized in Barnabas the Paul the gods who, according to their wont, had come down in the likeness of men. (Acts 14:11)