It depended on the region of ancient Greece and perhaps the time era too.
see list below taken from from Wikipedia.
Ποσείδαν (Poseídan),
Ποσειδάν (Poseidán) – Aeolic
Ποσειδάων (Poseidáōn) – Homeric
Ποσειδέων (Poseidéōn) – Ionic
Ποσοιδάν (Posoidán) – Arcadian
Ποτειδάν (Poteidán), Ποτειδάϝων (Poteidáwōn), Ποτειδάων (Poteidáōn), Ποτ(ε)ιδᾶς (Pot(e)idâs) – Doric
Ποτοίδαν (Potoídan) – Aeolic
Ποτοιδάϝων (Potoidáwōn) – Laconian
Ζευς is Zeus in upper and lower case. In all capitals it would be: ΖΕΥΣ
Zeus = Ζεύςbut in genitive becomes Διός.From the genitive derives a second type or nominative Δίας.So you can refer to Zeus either as Ζεύς or Δίας.
Ancient Greek: Ζεύς; Modern Greek: Δίας, Dias
In Greece, they spell all the gods names the same way to us... But in Greek letters it is spelled as ZeuV. YOU IDIOT NO ITS NOT GOD grrr were can i find the real answer
The Greek god's name is spelled 'Zeus'.It is spelled as Zeus and not as Zues.
Ͱερμης
The Greek word for "Hercules" is "Ηρακλής".
Ͱηρακλης = Herakles
Ἥρα = heera
Elies.
Demeter: Δημητηρ
Those letters spell cannibal and have nothing to do with Greek mythology.