Where does “nervio” come from?

nervio (Spanish) comes from Old Spanish nerbio, from Latin nervus, from Proto-Indo-European (s)new-.

nervio (Spanish): nerve

Definitions

Step	Language	Word	Meaning
1	Old Spanish	nerbio	—
2	Latin	nervus	A sinew, tendon, nerve, muscle; A cord, string or...
3	Proto-Indo-European	(s)new-	—

nervio — Etymology, Origin & Word History | Etymology Explorer