Ἅιδης

Ἅιδης (aides, "HAH-ee-dace") — Hades, the god of the dead and the world below — lives, in the record, exactly where the dead are most fought over. It appears 242 times across 46 works, and the top of the distribution is the poetry of grief and struggle: the Iliad (25), the Odyssey (22), Euripides's Heracles (18), Sophocles's Antigone (15), then Plotinus's Enneads (11) and Plato's Republic (11). Epic and tragedy hold the word; the philosophers pick it up after. It is a name before it is a place.

LSJ (Liddell–Scott–Jones, 9th ed., 1940) confirms this order, glossing the word "Hades, nether, to the nether world" and noting that "in Hom[er] only as pr[oper] n[ame] Hades" — the god himself, as when Zeus divides the cosmos: Ζεὺς καὶ ἐγώ, τρίτατος δʼ Ἀΐδης (Zeus kai egō, tritatos d' Aïdēs, "Zeus and I, and Hades third," Iliad 15.188). From the god the place is built by a genitive of belonging: εἰν Ἀΐδαο δόμοισι (ein Aïdao domoisi, "in the house of Hades," Odyssey 4.834) — the underworld named for whose it is.

A second LSJ entry records a separate word spelled alike, ἀϊδής (aïdēs, "ah-ee-DACE"), an adjective glossed "unseen, secret, blind," attested at Hesiod's Shield (Sc. 477) and Plato's Phaedo (79a). The lexicon keeps them apart; the ear that heard "the unseen one" in the god's name is a resonance, not an equation the record makes.

No etymology pointer is matched in the record — no Beekes, no Chantraine, no Frisk — so the deeper root goes honestly unsaid here.

The citable surfaces bunch in the tragedians and shift through the cases. Aeschylus's Agamemnon yields five, four the genitive Ἅιδου (Haidou, "of Hades") from Agamemnon 1115 and following, one the accusative Ἅιδην (Haidēn, "Hades," as object). Sophocles's Ajax holds seven more, ringing every case — nominative, genitive, dative, accusative. The word is spoken as a destination one is going toward.

When a place is only ever named for the god who holds it, have we named the place at all — or only its keeper?