Its source is Eireann, a Gaelic name meaning "Western Island."
The name Eryn ranked 959th in popularity for females of all ages in a sample of 2000-2003 Social Security Administration statistics and 3220th in popularity for females of all ages in a sample of the 1990 US Census.
Though this name appears on the 1990 U.S. Census lists, it is used by only a small percentage of the general population.
Erin has been widely used as a poetic name for Ireland in both songs and poems. It evokes a sentimental view of that country especially moving to its emigrant populations in North America and around the world. Such is the musical appeal of the name, however, that it is often encountered in non-Irish families.