The predicted planet was called Vulcan, the god of fire, since it must have a very hot ... sun's glare,” says Daniel Kennefick, author of No Shadow of a Doubt: The 1919 Eclipse That Confirmed ...

The name doesn’t come from the Star Trek universe but from the Roman god Vulcan, who is associated with fire, metal-working, forges and volcanoes. And it has a bit of history behind it ...