 In the genealogies, Mac Carthaigh - his forename, not his surname - is stated as being a native of Conmaícne Cúl Toland in what is now along the County Galway - County Mayo.Thus he was from the same tribal group of Jarlath of Tuam.This branch of the Conmaicne were said to "converge", or descend, from Cumhscraidh mac Céacht, who in turn was a descendant of Lugaid mac Con.