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CannonThe name Cannon is distributed throughout most of Ireland's counties but is most apparent in the counties of Donegal, Leitrim and Mayo.

Ui Canannain was the ancestral name of the Cannons and TirConnel (all of Co. Donegal and part of County Derry) was the "Land of the Cannons".

By the early 1600's the name of Ui Canannain had been anglicised to O'Cannon. Further anglicisation took place during the Penal Laws in the late 1700's and early 1800's and the name in Co. Donegal became Cannon. However in the east of the county and in the neighbouring counties of Derry and Tyrone the name, being spelt phonetically, became Canning.

O'Cannon, Cannon, Cannan, Canon, Canning are anglicised versions of the name Ui Canannain.

The Cannons are descended from two of Ireland's most renowned Kings: Conn of the Hundred Battles and Niall of the Nine Hostages. The O'Cannons have been described as "Ancient Princes of TirConnel" and "Valiant Chiefs" However their 350 year dynasty in TirConnel ended around 1250.

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