There are a large number of Noones in north Connacht, the name is rare elsewhere. They are a sept of the Uí Fiachrach with traditional descent from Niall of the Nine Hostages. Their main territory was in the parish of Calry near Sligo town. They are still in Sligo and in counties Mayo, Roscommon and Galway.Tthere is no mention of them in the Composition Book of Connacht but fifty years later in Strafford's Inquisition of Mayo (1635) the name occured many times as landholders in the barony of Murrisk. The name in Irish is Ó Nuadháin; It is stated that Lambe is used as a synonym of it (possibly from its similarity in sound to an uain, of the lamb).
Noone, is Ó Nuadháin in Irish. Taken from Rev. Richard Woulfe's rather comprehensive surname book, Sloinnte Gaedheal is Gall:
Originally posted by Rev. Woulfe (in his book in 1923) Ó Nuadhan - 'des. of Nuadha' (the name of an ancient sea divinity); the name of a Sligo family of the race of Cairbre, son of Niall of the Nine Hostages. This family anciently possessed the district of Callraighe Laithimh, nearly co-extensive with the present parish of Calry, near the town of Sligo. The name is still very common in Connacht. In the spoken language as I have heard it the final n is slender.