What does hellennes mean in Greek?

Hellenes is the correct spelling and this term is often used interchangeable with "Greek" during the Hellenistic Age.

In Greek mythology, Hellen was the King of Phthia (at the northern end of the Gulf of Euboea). He was the eponymous ancestor of all true Greeks. Therefore, Greeks eventually were called Hellenes in his honor.

The Hellenistic or Greek Age was from 333-63 BC. The Jewish homeland (Israel, then referred to as Judah) was conquered by Alexander the Great of Ancient Greece.

Jews during this time were said to be Hellenized. This meant they were influenced or taking on the culture, language and traditions of the Greek people surrounding them.