Breton kêr

← Breton kae (mention)

← Proto-Brythonic *kaɨr (inherited)

← Proto-Celtic *kagros (inherited)

← Welsh caer (cognate)

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

← Cornish ker (cognate)

← Middle Breton kaer (inherited)

→ Welsh caer (cognate)