Ó Maoldhomhnaigh
Ó MAOLDHOMHNAIGH—I—O Malowny, O Mollowny, O Mullowny, Malowny, Molowny, Mullowney, Moloney, Molony, &c.; 'descendant of Maoldomhnaigh' (devoted to Sunday, or to the Church); the name of a Dalcassian family who were chiefs of a district in the barony of Tulla, Co. Clare; now very numerous throughout Munster. Ó Maoldomhnaigh (which see) is the same surname, but the family is apparently different.
Alphabetical Index to Irish Surnames