Welsh diwedd

← Breton diwez (cognate)

← Proto-Brythonic *diweð (inherited)

← Proto-Celtic *dīwedom (inherited)

← Proto-Celtic *dī- (mention)

← Proto-Celtic *wedo- (mention)

← Cornish deweth (cognate)

← Old Welsh diued (inherited)

← Old Irish díad (cognate)

← Middle Welsh diued (inherited)

→ Welsh diwethaf (affix)

→ Welsh diweddar (suffix)

→ Old Irish deithbir (cognate)