[1] Their name originates from a mythical ancestor known as Conmac(c) (Old Irish: [ˈkˠʰɔnˠˌβ̃ɑkˠː]), meaning "hound-son" (con, prefix form of n-stem cú hound; mac, son).
Conmac(c) descended from Fergus mac Róich and Queen Medb of Connacht.
[7][4] Known Septs in south County Leitrim were: John O'Donovan wrote: The chief families of the Conmacians were the O'Fearralls, princes and lords of Annaly, or Longford; the Mac Rannalls, a name anglicised to Reynolds, who were Lords of Conmaincee of Moy-Rein and Muintir-Eolais, in Leitrim; the Mac Keoghes, who were chiefs in Galway, and also in Lenister; the MacShanleys; O'Rodaghans; MacDorchys; O'Mulveys; O'Morans, and O'Mannings, chiefs and clans in various parts of Longford, Leitrim, and Roscommon.
[9] Notables descended from the Conmhaicne include Cruimthear Mac Carthaigh, St. Jarlath of Tuam and some abbots of Clonmacnoise.
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