Where does “brotr” come from?

brotr (Old Breton) comes from Proto-Brythonic *brọdr, from Proto-Celtic brātīr, from Proto-Indo-European bʰréh₂tēr — brother.

Ancestry of “brotr”, step by step

StepLanguageWordMeaning
1Proto-Brythonic*brọdrbrother
2Proto-Celticbrātīrbrother
3Proto-Indo-Europeanbʰréh₂tērbrother

Words derived from “brotr”

Every word from Proto-Indo-European bʰréh₂tēr →Every word from Proto-Celtic brātīr →Every word from Proto-Brythonic *brọdr →