Where does “Meru” come from?

Meru is an English borrowing of Sanskrit मेरु, a term of unknown etymological origin and meaning.

Ancestry of “Meru”, step by step

Step	Language	Word	Meaning
1	Sanskrit	मेरु	—
2	Proto-Indo-European	móri	sea; standing water
3	Proto-Indo-European	mer-	to die; to disappear; sea, lake, wetland

Meru — Etymology, Origin & Word History | Etymology Explorer