Where does “ᡇᠷᡇᡏᡔᡅ” come from?

ᡇᠷᡇᡏᡔᡅ (Written Oirat) comes from Chagatai اورُمجی.

Ancestry of “ᡇᠷᡇᡏᡔᡅ”, step by step

Step	Language	Word	Meaning
1	Chagatai	اورُمجی	—

ᡇᠷᡇᡏᡔᡅ — Etymology, Origin & Word History | Etymology Explorer