Where does “ferir” come from?

ferir (Old Spanish) comes from Latin ferire, from Latin ferio, from Proto-Indo-European bʰer- — to bear, carry.

Ancestry of “ferir”, step by step

Step	Language	Word	Meaning
1	Latin	ferire	present active infinitive of feriō; second-person...
2	Latin	ferio	I hit, I strike, I smite, I beat, I knock; I cut,...
3	Proto-Indo-European	bʰer-	to bear, carry