MACGUINNESS
From Irish Pedigrees; or the Origin and Stem of the Irish Nation by John O'Hart
See "Guinness" page 311.
ART RUADH MACGUINNESS, who is No. 124 on the "Guinness" pedigree, and who was the first "Viscount Iveagh," was the first of the family that anglicised the name Magennis.
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