Mooney is a family name which is probably predominantly derived from the Irish Ó Maonaigh, pronounced Om-weeneey.
They are said to be descendants of the ancient Irish King Heremon, who, along with his brother Herber, conquered Ireland.
Baptismal records, parish records, ancient land grants, the Annals of the Four Masters, and books by O'Hart, McLysaght, and O'Brien were all used in researching the history of the Mooney family name.
These varied and often ancient records indicate that distant septs of the name arose in several places throughout Ireland.
The members of this sept were from Chieftain Monach, son of Ailill Mor, Lord of Ulster, who was descended from the Kings of Connacht.