Welsh Iwerddon

← Breton Iwerzhon (cognate)

← Proto-Brythonic *Iwerðon (inherited)

← Proto-Celtic *Φīweryū (inherited)

← Ancient Greek πίειρα (cognate)

← Proto-Indo-European *piHweryon- (inherited)

← Proto-Indo-European *piHwer- (mention)

← Cornish Iwerdhon (cognate)

← Sanskrit पीवर (cognate)

← Old Irish Ériu (cognate)

← Middle Welsh Iwerd (cognate)

→ Breton Iwerzhon (cognate)

→ Welsh Iwerddoneg (suffix)

→ Scottish Gaelic Èirinn (cognate)