Mac Mhaoltuile
Mac MHAOLTUILE—IV—M'Cultully, M'Cuntully, M'Cantully, M'Ethwille, MacAtilla, Tully, and, by 'translation,' Flood; 'son of Maoltuile' (devoted to the will, i.e., of God); older Mac Maoltuile, which see; the name of a medical family in Co. Roscommon, who were hereditary physicians to the O'Connors of Connacht. The name has been long corrupted to Mac an Tuile and Mac Tuile, erroneously supposed to signify 'son of the flood,' and accordingly anglicised Flood. See Ó Maoltuile.
Alphabetical Index to Irish Surnames