Arranmore Island is the largest inhabited island in County Donegal, and the second largest in all of Ireland, with a population of 528 in 2006, down from 543 in 2002, and over 600 in 1996. The island is part of the Donegal Gaeltacht. It is also known in English as Aran Island. In Irish the island was traditionally called Árainn the adjective mór (great) was added fairly recently. It was also sometimes called in Irish Árainn Uí Dhomhnaill the "Aran of the O Donnells".
