Where does “आर्यावर्त” come from?

आर्यावर्त (Sanskrit) comes from Sanskrit आवर्त, from Sanskrit आ, from Sanskrit धा, from Proto-Indo-European *dʰaH-.

आर्यावर्त (Sanskrit): Aryavarta, land of the Aryans, corresponding to the northern parts of the Indian subcontinent

Definitions

Aryavarta, land of the Aryans, corresponding to the northern parts of the Indian subcontinent

आर्यावर्त traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Sanskrit	आवर्त	whirlpool
2	Sanskrit	आ	separated form of आ-; With senses determined by...
3	Sanskrit	धा	to put, place, set, lay in or on
4	Proto-Indo-European	*dʰaH-	—

Step	Language	Word	Meaning
1	Sanskrit	आर्य	an Indo-Aryan, i.e. an Ārya, a self-designator of...
2	Pali	อริย	Thai script form of ariya