The given name Erinn is derived from the Irish Gaelic word "Éirinn," which means "Ireland." It is a feminine form of the name Erin, which has its roots in the ancient Celtic languages of Ireland and the British Isles.

In Irish mythology and folklore, Éirinn was the name given to the goddess of sovereignty and the personification of Ireland itself. The name is thought to have originated from the Old Irish word "Érenn" or "Ériu," which was used to refer to the island of Ireland.

The earliest known historical reference to the name Erinn can be found in the Book of Invasions, a medieval Irish manuscript that traces the legendary origins and migrations of the Irish people. In this text, Erinn is mentioned as one of the three wives of the mythical ruler Partholón, who is said to have been the first person to settle in Ireland after the biblical flood.

One of the most famous historical figures to bear the name Erinn was Erinn Caskie (1912-2007), an American author and educator who wrote several books on the history and culture of Virginia. Another notable Erinn was Erinn Smart (born 1983), an American actress and model who has appeared in various television shows and films.

In literature, the name Erinn appeared in the 19th-century novel "Erinn: A Tale" by Irish author John Banim (1798-1842). The novel explores the theme of Irish nationalism and the struggle for independence from Britain.

Other notable individuals with the first name Erinn include Erinn Westbrook (born 1984), an American actress and producer, and Erinn Hayes (born 1976), an American actress and comedian known for her roles in various TV shows and movies.

While the name Erinn has its roots in Irish culture and mythology, it has gained popularity across various parts of the world, particularly in English-speaking countries, as a feminine given name with a unique and cultural significance.