English 'Greece' comes via Latin Graecia from the Graikoi, a minor Greek tribe — the Romans met them first and named all Greeks after them, while the Greeks call themselves Hellenes and much of the Islamic world calls them Ionians.
A country in southeastern Europe on the southern tip of the Balkan Peninsula, the cradle of Western civilization.
English 'Greece' derives from Latin 'Graecia', from 'Graecus', which came from Greek 'Graikós' (Γραικός). This was the name of a people or tribe in northwestern Greece (Boeotia or Epirus). Aristotle mentions the Graikoi as an ancient people near Dodona. The name may derive from a PIE root meaning 'old' or 'venerable'. The Romans encountered these western Greeks first and applied their tribal name to all Greeks — a classic metonymy. The Greeks themselves used 'Hellenes' (Ἕλληνες) for themselves and 'Hellas' (Ἑλλάς) for their country
The country has two entirely separate naming traditions across world languages. European languages mostly use the Latin 'Greece/Graecia' line. But Arabic, Turkish, and Persian use 'Yunan' — from 'Ionia', a different Greek region. The Greeks themselves reject both and call their country Hellas (Ελλάδα).