In Greek mythology, Hephaestus is the god of fire and of metalwork — making things from metal, like armour, weapons, and jewellery. The other gods came to him when they needed a sword or a shield. Stories often show him at a forge, with a hammer, and they say he walked with a limp. The Romans told nearly the same story but called him Vulcan. English still uses that Roman name in daily life more than the Greek one: volcano comes from Vulcan, and you may hear Vulcan in films. Hephaestus itself belongs to myth classes, museums, and books about the gods. They are not two different gods; they are two names for the same figure. The name came into English from Latin Hephaestus, from Ancient Greek Ἥφαιστος. That Greek name is older than Greek itself — scholars call it pre-Greek — and nobody knows what it first meant. So there is no neat English puzzle hiding inside it.

赫淮斯托斯（希臘神話的火神、鍛造之神）。羅馬對應名是 Vulcan，多譯作伏爾坎。