summarise this: The god's name in the nominative is Ζεύς (Zeús). It is inflected as follows: vocative: Ζεῦ (Zeû); accusative: Δία (Día); genitive: Διός (Diós); dative: Διί (Dií). Diogenes Laërtius quotes Pherecydes of Syros as spelling the name Ζάς.[24]