In Greek capital letters, Heracles is spelled as ΗΡΑΚΛΗΣ.
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.
In Greek letters, "yiayia" is spelled γιαγιά. It means "grandmother" in Greek and is a term of endearment used for one's grandmother.
Απόλλων : Apóllo̱n
Η Ελλάδα είδη
The letters PFITH can spell a few short words in English : I if it hi hip tip fit hit pit pi phi (Greek letters) pith