Old Irish bríathar

← Proto-Celtic *brētrā (inherited)

← Proto-Celtic *brē- (mention)

← Proto-Celtic *bri- (mention)

← Welsh brwydr (cognate)

← Proto-Indo-European *bʰerH- (derived)

→ Welsh brwydr (cognate)

→ Irish briathar (inherited)

→ Scottish Gaelic briathar (inherited)

→ Scottish Gaelic briathrach (mention)

→ Manx breear (inherited)