Where does “般涅槃” come from?

般涅槃 (Middle Chinese) comes from Sanskrit परिनिर्वाण, from Sanskrit निर्वाण, from Sanskrit निस्, from Sanskrit नि, from Proto-Indo-Iranian ní, from Proto-Indo-European ni — down.

Ancestry of “般涅槃”, step by step

Step	Language	Word	Meaning
1	Sanskrit	परिनिर्वाण	completely extinguished or finished
2	Sanskrit	निर्वाण	blowing out, extinction, cessation, setting,...
3	Sanskrit	निस्	out, forth, away &c
4	Sanskrit	नि	down; back; in, into
5	Proto-Indo-Iranian	ní	down, downwards; in, into
6	Proto-Indo-European	ni	down

Every word from Proto-Indo-European ni →Every word from Proto-Indo-Iranian ní →Every word from Sanskrit नि →