| Clan Bryson: Formed to benefit all Brysons descended from the lands formerly known as Dalriada and now recognized as Scotland, Ireland, Isle of Mann, and Wales. Offers information on reunions and gatherings, branches, history of the clan and genealogy, crests and tartans, and links. |
| Clan de Bryan: Clan site for Bryans and Bryants and descendants of ancestors bearing the de Bryans name. Offering articles, history, coat of arms, message board, and membership. |
| Clan Flannery / Clann Fhlannabhra: Aims and objectives of the clan. |
| Clan MacDermot: Established in 1993 to gather and conserve genealogical information, to foster links between McDermotts worldwide and to provide a connection with the ancestral lands in Ireland. Membership open to all MacDermots, and those claiming ancestry from the MacDermont name. |
| Clan Maguire: Brief history, list of members and photograph of an ancestral castle. |
| Clan McCaffrey: Origin and early history of the clan as compiled by Michael R McCaffery of Montgomery, Alabama, USA. |
| Clan McCain: The origins and history of the clan name MacCain. Association, events and map of territory. |
| Clan McGovern: Worldwide clan research and resources. |
| Clan McLaughlin Society - Camann Chlann Lochlainn: A non-profit fraternal association based in the Republic of Ireland open to those who descend from a McLaughlin, or bear the McLaughlin name. Offers extensive clan history, lineage, clan genealogies, membership information, reunions, and Irish and clan related links. |
| Clan McShane Johnson MacSeai'n: Association provides the history of this Irish Clan, picture of the tartan, plus contact details for the chief and country representatives. |
| Clan O'Dea - Clan Ua Déaghaidh: Providing information on gatherings, genealogy, news, history and membership for those bearing the name of O'Dea, O'Day, Dee, or Day, and for all descendants claiming ancestry to this clan. |
| Clan O'Donnell - Cumann Chlann Dálaigh: Formed in 1989 for the benefit of those persons bearing ancestry to the O'Donnell anem, with the purpose of organizing clan gatherings, as well as researching and preserving Clan history and traditions. Offers newsletter, membership information, Gaelic songs, photos, annual gatherings, contacts and links. |
| Clan O'Gara - Clan Tir na nO'Sara: Provides information on the clan including message board, events and gatherings, Irish history and the Celts, and links. |
| Clan O'Malley Association: Family history, reunions and contact information. membership is open to all O'Malleys and related surname descendants and relatives. |
| Clan O'More: Ancient Irish family, O'Mordha, descended from Conal Cearnach, a Red Branch knight of Irish history. History, links and festivals. |
| Clann O'Gallchobahair, Gallagher: Clan history, surname variations, heraldry, myths and legends. |
| Clans And Names: A history of clans and names and the people associated with keeping them alive. |
| Irish Clans: Irish information site with genealogy and lineage information, clan listings, and Celtic links. |
| Irish Larkins of East Galway: Traces the O Lorcan Clan of East County Galway, Ireland and their overseas descendants. With a searchable database, origin of the Larkin surname, photos, and maps. |
| Kavanagh Family: The origin and early history of the Kavanagh clan and family. Details of notable clan members. Contact point. |
| Killoran Clan Reunion: Details of the Killoran Reunion in Tubbercurry. |
| McCain, O'Kane, McKane Surname DNA Project: Invitation to join a testing project, plus information on surname variations, the family crest and the original Irish territory. |
| O'Brien Clan: Promoting the interests of the descendants of Brian Boru. |
| O'Donoghue Society: Genealogy and family history of the O'Donoghue clan. |
| O'Mullally: History of OMullally and Lally Clann by D. P. OMullally is now available in paperback. |
| Of the Cullen Clan: A brief history of the Cullen's from Jamaica Plain. |
| The Septs of Leix: Association and historical re-enactment group based on the clans of Leix - the O'Mores, O'Kellys, O'Lalors, O'Dorans, O'Dowlings, O'Devoys and MacEvoys. Background, photographs, and events in California. |
Classical
