What was Hephaestus planet name?

Hephaestus is often associated with the hypothetical planet "Vulcan," which was proposed in the 19th century to explain anomalies in Mercury's orbit. However, Vulcan was never observed and is not recognized as a real planet in modern astronomy. Instead, Hephaestus, the Greek god of fire and craftsmanship, is more commonly linked to the Roman equivalent, Vulcan, rather than a celestial body. Today, Mercury remains the closest planet to the Sun, with no confirmed existence of a planet named Hephaestus or Vulcan.