The gods of the underworld were named Chthonian gods by the Greeks. They were ruled by the grim god Hades and his queen Persephone. These cool Greek mythology names are mysterious and tough, they will be perfect for your guarding or hunting dogs.
Aeacus: One of the three judges of the dead in the Underworld.
Aiakos: Another name for Aeacus.
Acheron: The god of the underworld river of pain whose brackish stream guarded the borders of Hades.
Akheron: Another name for Acheron.
Amphiaraus: The prophetic Daemon of a subterranean oracle at Oropus in Boeotia.
Arae: The underworld Daemones of curses.
Arai: Another name for Arae.
Ascalaphus: An underworld Daemon who tended the orchards of Hades.
Askalaphos: Another name for Ascalaphus.
Cacodaemones: Evil spirits which issued forth from the underworld to cause harm.
Kakodaimones: Another name for Cacodaemones.
Cerberus: The mighty, three-headed, serpent-maned hound of Hades who guarded the entrance to underworld.
Kerberos: Another name for Cerberus.
Ceuthonymus: A mysterious underworld Daemon. He was the father of Hades cattleman Menoetes.
Keuthonymos: Another name for Ceuthonymus.
Charon: An underworld Daemon who ferried the souls of the dead across the streams of Acheron into Hades.
Kharon: Another name for Charon.
Cocytus: The god of the underworld river of tears and wailing.
Kokytos: Another name for Cocytus.
Core: "The maiden," another name for Persephone.
Kore: Another name for Core.
Cronus: The old king of the Titans. He was appointed king of the islands of the blessed, the home of the favoured dead.
Kronos: Another name for Cronus.
Daeira: An underworld Nymph and companion of the goddess Persephone.
Empusa: A monstrous underworld Daemon with flaming hair, the leg of a goat and a leg of bronze.
Empousa: Another name for Empusa.
Epiales: The underworld Daemon of nightmares.
Erebus: The primeval god of darkness.
Erebos: Another name for Erebus.
Erinyes: The three goddesses of vengeance and retribution.
Eurynomus: An underworld Daemon who stripped the flesh from the corpses of the dead.
Eurynomos: Another name for Eurynomus.
Gorgyra: An underworld Nymph. She was the wife of the River-God Acheron.
Hades: The grim King of the Underworld, the ruler of the dead.
Haides: Another name for Hades.
Aidoneus: Another name for Hades.
Hecate: The goddess of magic, necromancy and the haunting ghosts of the dead.
Hekate: Another name for Hecate.
Hermes Chthonius: The guide of the dead who led the ghosts to their final resting place in Hades.
Khthonios: Another name for Hermes Chthonius.
Hypnus: The god of sleep who dwelt in a silent realm on the borders of Hades.
Hypnos: Another name for Hypnus.
Keres: Monstrous she-Daemones of violent death and disease.
Lamiae: Underworld Daimones in the train of the goddess Hekate.
Lamiai: Another name for Lamiae.
Lampades: Torch-bearing underworld nymphs in the train of the goddess Hecate.
Lethe: The goddess of the underworld river of oblivion.
Leuce: A Nymph abducted by the god Hades to the Eleusinian fields where she was transformed into a white poplar.
Leuke: Another name for Leuce.
Macaria: The goddess of blessed death or else the leader of the blessed dead
Makaria: Another name for Macaria.
Melinoe: A frightful underworld Daemon who led ghosts forth from the underworld to haunt the earth.
Menoetes: An underworld Daemon who herded the black-skinned cattle of Hades.
Menoites: Another name for Menoetes.
Minos: One of the three Judges of the Dead.
Minthe: An underworld nymph loved by the god Hades.
Moirae: The three goddesses of fate.
Moirai: Another name for Moirae.
Mormolyceia: Underworld Daemones in the train of Hekate.
Mormolykeia: Another name for Mormolyceia.
Nyx: The primeval goddess of the night.
Oneiri: The Daemones of dreams.
Oneiroi: Another name for Oneiri.
Orphne: An underworld nymph, the wife of the river Acheron.
Persephone: The goddess Queen of the Underworld.
Pyriphlegethon: The god of the infernal river of fire.
Rhadamanthys: One of the three Judges of the Dead and king of the Elysian Fields, home of the favoured dead.
Styx: The goddess of the underworld river of hate, whose streams encircled the entire realm of the dead.
Tartarus: The primeval god of the dark.
Tartaros: Another name for Tartarus.
Thanatus: The winged Daemon of death. He was the minister of Hades.
Thanatos: Another name for Thanatus.
Trophonius: The Daemon of the subterranean oracle of Lebadea in Boeotia.
Trophonios: Another name for Trophonius.