Where does “Arierin” come from?

Arierin (German) comes from German Arier, from Sanskrit आर्य, from Pali อริย — Thai script form of ariya.

Ancestry of “Arierin”, step by step

StepLanguageWordMeaning
1GermanArierAryan
2Sanskritआर्यan Indo-Aryan, i.e. an Ārya, a self-designator of...
3PaliอริยThai script form of ariya
Every word from Pali อริย →Every word from Sanskrit आर्य →Every word from German Arier →