This is the reverse of the actual situation.
Hades was the Greek god of the underworld, and Pluto is his Roman counterpart. The English language uses the Roman god names for the 5 planets known to them, and Neptune and Pluto (discovered much later). Only Uranus has a Greek god's name (the Latinized form of Ouranos).
Originally, the Romans had an earth-god named Dis Pater, often shortened to Dis.
Pluto was named for the Roman god of the dead. His counterpart in Greek myth is Hades.
god of the underworld
Proserpina. Greek: Persephone
Vulcan(us) is the Roman name of the Greek god Hephaestus.
Hephaestus is a Greek god. His Roman name is Vulcan.
The god Mercury was Roman. His Greek name was Hermes.
neptune is the roman god. the greek god is Poseidon.
Ares is the Greek God of War. Mars is his Roman name.
The Roman equivalent to Hermes the Greek god was Mercury.
He was a Greek god; he has no Roman name.
His Roman name was Mars.
The Roman god of the sky is Jupiter, and the Greek god of the sky is Zeus.