De Moiréis
de MOIRÉIS—XI—de Mareys, de Marries, Morreis, Morris, and incorrectly Morrison; Norman 'de Mareys,' 'de Marreis,' Latin 'de Marisco,' i.e., of the marsh (French marais), from residence thereby; a common surname in many parts of the south of Ireland, especially in Kilkenny, Tipperary, Offaly, Leix, Cork and Limerick, where it is now generally anglicised Morris. In the neighbourhood of Kilmallock, the anglicised form is popularly Morresh, but officially it is incorrectly turned into Morrison. A family of the name settled, in 1485, at Galway and became one of the 'tribes' of that city.
Alphabetical Index to Irish Surnames