The Turks don’t call Greece, Greece. They call it Yunanistan. It comes from the Sanskrit yavana which comes from Ionia which was an ancient land in what is now Turkey that was ruled by Greeks.
Of course, Greece doesn’t call itself Greece either. The official name of the country is the Hellenic Republic.
Those who call Greece, Greece get the word from the Romans who called the land Graecia.
Yunanistan William Lawrence Sr Omnibit 2-19-20