Flood—This name is the anglicised form of about four Irish sept names in the Five States of Ireland. The McTullys (written Mac Taithligh) which are also McAtilla, ruled over "Hy Leary of Lough Lir," Co. Fermanagh, which district appears to have been near Lough Erne, in the barony of Lurg. Several of the name are mentioned as Abbots and Erenachs of Devenish. They changed the name to Flood in latter days (Mac An Tuile).
Another sept who wrote their name Mac Taichligh were chiefs of the district which comprised the greater part of the parish of Drung, barony of Tullygarvey, Co. Cavan. This sept as well as anglicising the name Tully have also anglicised it Flood. The first name referred to, M'Atilla (Mac An Tuille), in the districts of Kilmacrenan and Innishowen, as well as in all parts of Ulster, has changed the name to Flood. Another name, O'Maoltuile, in Cavan, Westmeath, Kilkenny. Tipperary and Waterford has assumed the name of Flood. Thina (O'Tuine), a sept that formerly occupied a district in Lower Connello, Co. Limerick, have in the Western parts of Mayo and Galway, especially in the district of Cong, changed their name to Flood.
Alphabetical Index of Surnames