 The pedigree of the kings of Loígis ("Genelach Rig Laigsi") in the Book of Leinster says that Cernach was the son of Ceinneidigh, who was the son of Morda ["Cernaig m Ceinneidig m Morda"].It was not until the nineteenth century that all of the seven Loígis septs were definitively identified with a fixed group of surnames, which were the "O'Mores, O'Kellys, O'Lalors, O'Devoys or O'Deevys, Macavoys, O'Dorans, and O'Dowlings".With the exception of the O'Devoys or O'Deevys and the Macavoys, Chichester's 1607 report named the other five septs.