Why are Greeks called the glory?

Answer 1

No to the answer below. Greece is from the Latin Grecia which is what the Romans called Hellas[Greece] & the Hellenes[Greeks] is what Greeks call[ed] themselves, here is an explanation:

Greece is called Hellas or [H]Ellada by the Greek people. But since the ancient days they have stopped pronouncing the "H". The question "where does the word Greece come from?" has arisen. The word Greece comes from the Romans. From a Greek colony in Magna Grecia (Sicily and Southern Italy) one of the first Greek groups that the Romans came into contact with. Since these Hellenics lived in a place the Romans called Magna Grecia, they were called Grecians or Greek. The name just stuck.

because they are from Greece

They just added a suffix that sounded nice i guess.

Answer 2

It's a tough read, but Paul Carteledge's book, Thermoplyae, will give you all the answers.