(O) Hannon

Although there are many substantial families named Hannon in Munster and Connacht, the ancient Annals and other sources of information regarding the septs of mediaeval Ireland seldom mention the name O'Hannon. The death of Maelisa O'Hannen (Ó hAnáin), prior of Roscommon, in 1266 is one of the few such. According to the census of 1659 the name was then numerous in the barony of Athlone, County Roscommon while Haneens were found in considerable numbers in the barony of Bunratty, County Clare. The prefix O, dropped in the submergence of Gaelic Ireland, has not generally been resumed. Strictly speaking Hannon is the anglicized form of the Gaelic Ó hAnnáin. This name is chiefly associated with County Limerick. Another Gaelic surname, Ó hAinchin, that of a family of Siol Anmchadha belonging to south east Galway, normally anglicised Hanneen, has, by attraction, become Hannon in most cases, though Hanneens are also found in western counties. It is of interest to note that older people in Clare and Galway call this name Hanheen thus keeping close to the Irish pronunciation Ó hAnchin. Furthier there is Ó hAnnacháin which is called Hannon rather than Hanahan in County Limerick. The name Hannon today is principally found in County Limerick and in Counties Galway and Roscommon. Patrick Hannan (1842-1925), who was born in County Clare, discovered the Kalgoorlie goldfield in Western Australia which contains "the richest square mile of gold in the world".

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