Etymology of name

The native Armenian name for the country is Hayk‘. The name in the Middle Ages was extended to Hayastan, by addition of the Iranian suffix -stan (land). The name has traditionally been derived from Hayk (Հայկ), the legendary patriarch of the Armenians and a great-great-grandson of Noah, who according to Moses of Chorene defeated the Babylonian king Bel in 2492 BC, and established his nation in the Ararat region. The further origin of the name is uncertain.
The exonym Armenia is first attested in the Old Persian Behistun inscription (515 BC) as Armina. Greek Ἀρμένιοι "Armenians" is attested from about the same time, perhaps the earliest reference being a fragment attributed to Hecataeus of Miletus (476 BC). Herodotus (440 BC) has Ἀρμένιοι δὲ κατά περ Φρύγες ἐσεσάχατο, ἐόντες Φρυγῶν ἄποικοι. "the Armenians were equipped like Phrygians, being Phrygian colonists" (7.73). Some decades later, Xenophon, a Greek general waging war against the Persians, describes many aspects of Armenian village life and hospitality. He relates that the people spoke a language that to his ear sounded like the language of the Persians.