Where does “bro” come from?

bro (Welsh) comes from Middle Welsh bro, from Proto-Brythonic broɣ, from Proto-Celtic mrogis, from Proto-Indo-European morǵ- — edge, boundary, border; frontier, border.

bro (Welsh): region, country, land, neighbourhood, native...

Definitions

region, country, land, neighbourhood, native...

Ancestry of “bro”, step by step

Step	Language	Word	Meaning
1	Middle Welsh	bro	—
2	Proto-Brythonic	broɣ	country, region, territory
3	Proto-Celtic	mrogis	border, borderland, march, mark; region, country,...
4	Proto-Indo-European	morǵ-	edge, boundary, border; frontier, border

Words derived from “bro”

brofydd
bröydd

Every word from Proto-Indo-European morǵ- →Every word from Proto-Celtic mrogis →Every word from Proto-Brythonic broɣ →