Where does “阿閦如来” come from?

阿閦如来 (Japanese) comes from Japanese 如来, from Middle Chinese にょらい.

Ancestry of “阿閦如来”, step by step

Step	Language	Word	Meaning
1	Japanese	如来	a buddha
2	Middle Chinese	にょらい	—

阿閦如来 — Etymology, Origin & Word History | Etymology Explorer