Where does “aryan” come from?

aryan (English) comes from Sanskrit आर्य, from Pali อริย — Thai script form of ariya.

Ancestry of “aryan”, step by step

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