Vulcan was a hypothetical planet supposed to revolve around the Sun inside the orbit of Mercury, invoked to explain certain irregularities in Mercury's orbit. The planet was proposed as a hypothesis in 1859, and abandoned not later than 1915.
There's also non-Star Trek precedents for Vulcan being the name of a planet. Vulcan is a character in Greek mythology after all. But I suppose a hot planet's moon would be more appropriate.
Which is merely a Klingonization of Rorapandi from 20,000 Leagues under the Sea (1954).They should call it Rura Penthe.
Nemo: The prison camp of Rorapandi, the white man's grave.
Arronax: I thought it had been abolished.
Nemo: Nothing is abolished that turns a profit to that hated nation.
—From the Disney Film
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