Ó Maoilstéighe
Ó MAOILSTÉIGHE—I—O Mulstegia, O Molstaygh, O Mulstey, O Mustey, Mustay, M'Stay, MacStay; 'descendant of Maolstéighe'; the name of an ecclesiastical family in the diocese of Dromore, Co. Down; now very rare.
Alphabetical Index to Irish Surnames