Mac Uilleam, from mac, son; Uilleam, genitive of Uilliam, William. Son of William. Fitzwilliam, Williams and Mac William are forms of the word, the last being the Irish name assumed by the Bourkes of Connaught on the death of their chief, William De Bourg, third earl of Ulster.The son of WilliamWilliam, William; sun, son. Son of William
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Book - Yorkshire Church Notes
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