The Irish Surname Noon is an anglicized form of Gaelic Ó Nuadháin meaning”‘descendant of Nuadhán.” The personal name Nuadhán is derived from Nuadha, the name of an ancient Celtic god. The Noon’s were a sept of the Uí Fiachrach in Sligo, and today they are primarily found in neighboring counties Mayo and Galway. In the census of 1847, of 100 families of Noon in Ireland, 25 were in Mayo and 20 in Galway. the remainder spread among the remaining 30 counties. The name Noon was first established in the New World in the 19th Century.