Diarmaid mac Tadgh Ua Ceallaigh died in 1065.
Diarmaid or Diarmuid [dear-mwid]. Both spellings are used, the second is an older form.
Mac Beathaidh mac Ainmire died in 1041.
Mac Cairthinn mac Coelboth died in 446.
The last name McDermott is of Irish origin, derived from the Gaelic surname "Mac Diarmada," which means "son of Diarmaid." The name Diarmaid is believed to mean "free man" or "without enemy." McDermott is associated with several Irish clans, particularly in the provinces of Connacht and Ulster, where it has historical significance. Over time, the name has spread beyond Ireland, particularly to countries like the United States and Australia due to emigration.
Pilib mac Séamus Mac Mathghamhna died in 1486.
Tadhg mac Dáire Mac Bruaideadha died in 1652.
Aed mac Conchbair Mac Aodhagáin died in 1359.
Mac Cuu died in 1735.
Mac Colville died in 2003.
Mac Henderson died in 2009.
Mac Price died in 2003.
Mac Sebree died in 2010.