Note: The Earth tradition of naming major planets after Roman gods ran up against a small problem when Bacchus was discovered on its 17,000-year trans-Neptunian orbit. The name had already been taken by an utterly insignificant asteroid whose only claim to fame was that it could be seen with 20th-century telescopes. Ultimately the matter was resolved by mining the asteroidal Bacchus down to a few bits of navigationally-hazardous gravel, at which point it was considered "gone." The name was then more fittingly bestowed upon the icy sub-giant caroming drunkenly through the Kuiper belt. 

Addendum: The moons in Bacchus orbit are collectively known as the Bacchanal, obviously.