Where does “bro” come from?

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

Ancestry of “bro”, step by step

StepLanguageWordMeaning
1Proto-Brythonicbroɣcountry, region, territory
2Proto-Celticmrogisborder, borderland, march, mark; region, country,...
3Proto-Indo-Europeanmorǵ-edge, boundary, border; frontier, border

Words derived from “bro”

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