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Hades' Greek name is Hades.
Yes, Hades the brother of Zeus and Poseidon, is the King of the Underworld, which is called 'realm of Hades' or (incorrectly)'Hades' after his name.
Hades is the God of the Underworld.
Hades is not, and never was 'the devil'.Hades is the God of the dead and the ruler of the Underworld.
Pluto is Hades' roman name.