Cornish bronn

← Breton bronn (cognate)

← Proto-Brythonic *bronnā (inherited)

← Proto-Celtic *brusnā (inherited)

← Proto-Celtic *brusū (mention)

← Proto-Celtic (mention)

← Welsh bru (mention)

← Irish broinn (cognate)

← Cornish bron (cognate)

→ Cornish diwvron (prefix)

→ Cornish dywvron (prefix)