Hermēs (Ἑρμῆς) refers to the Greek messenger deity, and also to a Christian greeted by Paul in Romans 16:14. In Acts 14, the Lystrans call Paul "Hermes" because he was the chief speaker — Hermes being the divine herald, messenger of the gods.
The incident at Lystra (Acts 14:8-18) provides a fascinating NT encounter with paganism. When Paul heals a lame man, the crowd shouts "The gods have come down in the likeness of men!" — Barnabas is Zeus, Paul is Hermes. Paul's response is a masterclass in contextualized evangelism: he meets them in their framework before redirecting to the living God. The irony is poignant: Paul, called Hermes the divine messenger, is indeed a herald — but of the true God, not Zeus. The missionaries tear their clothes in dismay at being deified, insisting on their shared humanity.
The name Hermēs gives us "hermeneutics" — the art of interpretation, because Hermes was the divine interpreter between gods and men. Paul as unintentional "Hermes" is delicious irony: the apostle is indeed the interpreter and messenger of God, delivering the divine logos. That the same name designates a Roman Christian (Rom. 16:14) shows how early believers carried and redeemed pagan names.