Erinys and aisa (which is synonymous with moira) go back to what is perhaps the oldest known form of Hellenic speech, the Arcado-Cypriot dialect.
Dodds grounds aisa philologically as among the most archaic strata of Greek religious thought, synonymous with moira and linked to Erinys in a pre-Olympian complex of compulsion and retribution.
, The Greeks and the Irrational, 1951thesis