Welsh crëyr

← Proto-Brythonic *krexVr (inherited)

← Proto-Celtic *korxsā (inherited)

← German Reiher (cognate)

← Proto-Germanic *hraigrô (mention)

← Proto-Indo-European *(s)kreik- (derived)

← Proto-Indo-European *(s)kreig- (mention)

← Dutch reiger (cognate)

← Middle Welsh crehyr (inherited)

← Middle Breton querhair (cognate)

→ English heron (cognate)