Where does “brun” come from?

brun (Romanian) comes from French brun, from Italian Bruno, from Medieval Latin brunus, from Frankish brūn, from Proto-Germanic *brūn, from Proto-Germanic brūnaz, from Proto-Indo-European bʰerH- — to pierce; to strike; brown.

brun (Romanian): brown; brown or dark-haired

Definitions

brown; brown or dark-haired

Ancestry of “brun”, step by step

Step	Language	Word	Meaning
1	French	brun	brown; brown-haired person
2	Italian	Bruno	dark gray, almost black
3	Medieval Latin	brunus	brown, brunet
4	Frankish	brūn	brown, dark, shiny
5	Proto-Germanic	*brūn	—
6	Proto-Germanic	brūnaz	brown
7	Proto-Indo-European	bʰerH-	to pierce; to strike; brown

Every word from Proto-Indo-European bʰerH- →Every word from Proto-Germanic brūnaz →Every word from Proto-Germanic *brūn →