Where does “brainja” come from?

brainja (Proto-Albanian) comes from Proto-Indo-European bʰreHi- — to cut, spoil; to snip, split.

Ancestry of “brainja”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	bʰreHi-	to cut, spoil; to snip, split

brainja — Etymology, Origin & Word History | Etymology Explorer