Wiki and OED:
“Hellenic” originates from the Ancient Greek Hellēnikós, derived from Hellēn, referring to the Greek-speaking people and their culture. It is rooted in the mythological figure Hellen, the son of Deucalion and progenitor of the Greek race, rather than the female Helen of Troy. The term signifies belonging to Greece, originating from Hellas (Greece).
That is incorrect.
Wiki and OED: “Hellenic” originates from the Ancient Greek Hellēnikós, derived from Hellēn, referring to the Greek-speaking people and their culture. It is rooted in the mythological figure Hellen, the son of Deucalion and progenitor of the Greek race, rather than the female Helen of Troy. The term signifies belonging to Greece, originating from Hellas (Greece).