The dative has replaced the nominative in a few regional Irish dialects (particularly Galway-Connemara and Waterford).

[1] Poets and nineteenth-century Irish nationalists used Erin in English as a romantic name for Ireland.

[3] According to Irish mythology and folklore, the name was originally given to the island by the Milesians after the goddess Ériu.

The phrase Erin go bragh ("Éire go brách" in standard orthography, dative "in Éirinn go brách" "in Ireland forever"), a slogan associated with the United Irishmen Rebellion of 1798, is often translated as "Ireland forever".

[4] The songs 'Let Erin Remember' and 'Érin grá mo chroí' are more examples of the word's usage in Irish romantic nationalism.