A topographic map of Ireland, after which Erin is named
|Word/Name||Hiberno-English derivative of Irish “Éirinn”|
|Meaning||Ireland (West), green water, Peace|
|Region of origin||Gaelic & Celtic|
|Related names||Ehrynn, Erinn, Eryn, Erynn, Iorn|
|Popularity||see popular names|
|Look up Erin in Wiktionary, the free dictionary.|
Erin is a Hiberno-English derivative of the Irish word "Éirinn". ("Éirinn" is the dative case of the Irish word for Ireland - "Éire", genitive "Éireann"). Poets and nineteenth-century Irish nationalists used Erin in English as a romantic name for Ireland. In this context, along with Hibernia, Erin is the name given to the female personification of Ireland.
Erin go bragh ("Éirinn go brách" in standard orthography), a slogan dating from the 1798 revolution, is often translated as "Ireland forever". The etymology of the word as it drifted throughout the Gaelic region gave rise to its use by the early Scots to both mean Ireland and "west" - as Ireland lies to the west of Scotland.
Usage as a given or family name 
As a given name, Erin is used for both sexes, although, given its origins, it is principally used as a feminine forename. It first became a popular given name in the United States. Erin is also a name for Ireland in Welsh, and is one of the 20 most popular girls' names in Wales.
As a family name, Erin has been used as one of the many spellings of the name of the Scottish clan "Irwin" - which was involved in the Scottish Plantations of Ireland. However, their name was originally derived from the place of the same name near Dumfries, and means "green water", from Brittonic ir afon.