Proto-Celtic *Φīweryū

→ Breton Iwerzhon (inherited)

→ Welsh Iwerddon (inherited)

→ Danish irer (derived)

→ Irish Éire (inherited)

→ Scottish Gaelic Èirinn (derived)

→ Ancient Greek Ἰέρνη (derived)

→ Ancient Greek Ἰουερνία (derived)

→ Manx Nerin (inherited)

→ Cornish Iwerdhon (inherited)

→ Latin Hibernia (derived)

→ Latin Ivernia (derived)

→ Middle Irish Ériu (inherited)

→ Portuguese Irlanda (derived)

→ Old Irish Ériu (inherited)