Aryan is a designation originally meaning “civilized”, “noble”, or “free” without reference to any ethnicity. It was first applied as a self-identifying term by a migratory group of people from Central Asia later known as Indo-Iranians (who settled on the Iranian Plateau) and, later, applied to Indo-Aryans (who traveled south to settle northern India).
This is a companion discussion topic for the original content at https://www.worldhistory.org/Aryan/.