Where does “anāmaya” come from?

anāmaya (Pali) comes from Sanskrit अनामय, from Sanskrit अन-, from Proto-Indo-European n̥-, from Proto-Indo-European ne — not.

Ancestry of “anāmaya”, step by step

Step	Language	Word	Meaning
1	Sanskrit	अनामय	healthy; health; sanitation
2	Sanskrit	अन-	A negating prefix. non-, un-, a-, an-, etc
3	Proto-Indo-European	n̥-	not, un-
4	Proto-Indo-European	ne	not

anāmaya — Etymology, Origin & Word History | Etymology Explorer