Where does “brdo” come from?

brdo (Slovak) comes from Proto-Slavic bьrdo, from Proto-Indo-European bʰerh₃- — to hit with a sharp instrument.

brdo (Slovak): reed

Definitions

Step	Language	Word	Meaning
1	Proto-Slavic	bьrdo	weaving comb, reed; hill, mountain
2	Proto-Indo-European	bʰerh₃-	to hit with a sharp instrument

brdo — Etymology, Origin & Word History | Etymology Explorer