Armenians constitute the main population of Armenia and the de facto independent Nagorno-Karabakh Republic. There is a wide-ranging diaspora of around 5 million people of full or partial Armenian ancestry living outside of modern Armenia. The largest Armenian populations today exist in Russia, the United States, France, Georgia, Iran, Ukraine, Lebanon, and Syria. With the exceptions of Iran and the former Soviet states, the present-day Armenian diaspora was formed mainly as a result of the Armenian Genocide. 

Historically, the name Armenian has come to internationally designate this group of people. It was first used by neighbouring countries of ancient Armenia. The earliest attestations of the exonym Armenia date around the 6th century BC. In his trilingual Behistun Inscription dated to 517 BC, Darius I the Great of Persia refers to Urashtu (in Babylonian) as Armina (in Old Persian; Armina ( ) and Harminuya (in Elamite). In Greek, Αρμένιοι "Armenians" is attested from about the same time, perhaps the earliest reference being a fragment attributed to Hecataeus of Miletus (476 BC). Xenophon, a Greek general serving in some of the Persian expeditions, describes many aspects of Armenian village life and hospitality in around 401 BC. He relates that the people spoke a language that to his ear sounded like the language of the Persians.
When did Darius 1 the Great describe them?
 In his trilingual Behistun Inscription dated to 517 BC, Darius I the Great of Persia