Old Irish brón

← Proto-Celtic *brugnos (inherited)

← Proto-Celtic *bruginos (mention)

← Proto-Celtic *broginos (mention)

← Proto-Celtic *brognos (mention)

← Proto-Indo-European (derived)

← Proto-Indo-European *gʷrewHǵʰ- (mention)

← Proto-Indo-European *-nós (mention)

← Proto-Indo-European *bʰreg- (mention)

→ Irish brón (inherited)

→ Scottish Gaelic bròn (inherited)

→ Old Irish brónach (affix)