Ó Caoimh

O'Keeffe (Irish: Ó Caoimh), also known as simply O'Keefe, Keef, or Keefe, is an Irish Gaelic clan based most prominently in what is today County Cork, particularly around Fermoy and Duhallow. The name comes from caomh, meaning "kind" or "gentle"; some reformed spellings present it as Ó Cuív and the feminine form of the original is Ní Chaoimh. As the primary sept of the Eóganacht Glendamnach, the family were once Kings of Munster from the 6th to the 8th centuries.

The original Caomh, from whom the family descend, lived in the early eleventh century, and was descended from Cathal mac Finguine, celebrated King of Munster and the most powerful Irish king of the first half of the 8th century. See the main article, Eóganachta, for more discussion, as well as Eóganacht Glendamnach, the specific sept of the family.

The O'Keeffes are famous for claiming descent from the goddess Clíodhna and have a beloved story about her marriage to Caomh (Franklin, pp. 81 ff). Her sister Aibell competed for his affections but Clíodhna ultimately triumphed using sorcery.

For all of their history the family has been strongly associated with County Cork. Originally the territory of the family lay along the banks of the Blackwater river, near modern Fermoy, and were active in the wars of the twelfth century between the O'Connors and the Eoghanacht dynasties of Munster.

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