Where does “अचलनाथ” come from?

अचलनाथ (Sanskrit) comes from Sanskrit अचल, from Sanskrit अ-, from Proto-Indo-Iranian a-, from Proto-Indo-European n̥-, from Proto-Indo-European ne — not.

Ancestry of “अचलनाथ”, step by step

अचलनाथ traces back through two separate lines of ancestry.

via Sanskrit अचल

Step	Language	Word	Meaning
1	Sanskrit	अचल	a mountain, rock; the deity Acala
2	Sanskrit	अ-	un-, not; Used in the formation of imperfect,...
3	Proto-Indo-Iranian	a-	un-, a-
4	Proto-Indo-European	n̥-	not, un-
5	Proto-Indo-European	ne	not

via Sanskrit नाथ

Step	Language	Word	Meaning
1	Sanskrit	नाथ	refuge, help, resort; protector, patron,...
2	Proto-Indo-Aryan	HnaHtʰás	—
3	Proto-Indo-Iranian	HnaHtʰás	—
4	Proto-Indo-European	h₃neh₂-	to enjoy

Every word from Proto-Indo-European ne →Every word from Sanskrit अ- →Every word from Proto-Indo-European n̥- →