Other branches of the clan: MacDermott, MacDermott Roe, MacDermot, Kermode, McDermitt, McDermid, MacDevitt, Darmody, Dermody, McDonald, McEnroe, McEvoy, McInerney, MacKaleary, Mack, McNamara, McNamee, Deyermott, Diarmond, Diermott, Diurmagh, Diarmod, Diarmid, de Ermott, Dermott, de Yermond
Irish Clan Name: Mac Diarmada

The name MacDermott is one of the hundred most commonly occurring Irish names. In the original clan heartland of County Roscommon, it is the second most common, and also frequently found in County Donegal and County Tyrone. It is not usually found without the "Mac" prefix other than in County Leitrim, where the name Dermot or Dermott is quite common. The Irish Clan name Mac Diarmid means "son of Diarmid (or Dermot)". Due to the fact that the letter "D" in spoken Irish following a "C" tends to be softened or "aspirated" and so often disappears, the name MacDermot in some parts of the Connacht Province has changed over the centuries to become the Anglicised version Kermode.

Ballinnafad is part of the ancestral home of the McDermotts and forms a stage of the Beara-Breifne Greenway which is based on the historic march of O'Sullivan Beara in 1603.