Welsh modryb

← Breton moereb (cognate)

← Proto-Brythonic *mọdreb (inherited)

← Proto-Celtic *mātrikʷā (inherited)

← Proto-Celtic *mātīr (mention)

← Irish máthair (cognate)

← Proto-Indo-European *méh₂tēr (derived)

← Cornish modrep (cognate)

→ English mort (derived)

→ Breton moereb (cognate)