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|A Donlin Family History by Dan Jensen|
| The Donnellan and
Mike Donlin’s parents had the surnames Donnellan and Mealy. We begin with some background information on these names.
The Donnellan Name
It is also spelt Donlan and Donlon. In Irish it is Ó Domhnalláin, indicating descent from the Domhnallán mentioned above.
The Mealy Name
According to ancient genealogies of Ireland, the O'Malley clan was descended from the eldest son of the High King of Ireland, Brian Orbsen, king of Connaught, who was killed at the battle of Dam Chluain near Tuam, circa A.D. 388. In the Book of Rights (leabhar na gCeart), the O'Malleys are listed as being tributary kings to the provincial kings of Connaught. They were the hereditary lords of the region called Umhalls (umall, territory) which was latinised as Umallia and later anglicized as the Owels, a territory which compromised the baronies of Murrisk and Burrishoole. The barony of Murrisk was called Umhall Uachtarach of Upper Owel and included the islands of Clare, Inishturk, Caher, Inishbofin, Inishark and the smaller islands in the neighborhood, including a multitude in Clew Bay. The barony of Burrishoole was called Umhall Iochtarach or Lower Owel and originally included Achill. The two baronies were referred to as 'Umhall Ui Mhaille' (territory of the O'Malleys) or the Two Owels.
The Life and Times of Grace O'Malley 
The "Mealy" surname of West Ireland is not the only occurrence of "Mealy". Mealys appear to have immigrated from England, Germany, and Italy, so all Mealys cannot be expected to descend from the Irish O'Malley line.