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| | History |
 | | Ua Cearbhaill (O'Carroll) and Ua Ruiarc (O'Rourke) overtook them, and slew some of their people, among whom was the son of Ua h-Ifearnain." To this entry O'Donovan subjoins a note: "Now Heffernan". |
 | | This family was seated in the territory of Uaithne Cliach, now the barony of Owney, in the north-east of the County Limerick." There were, therefore, two families or clans of Hiffernans, coming of different stocks, in Ireland, one in Brega in Meath, the other, a Dalcassian clan from Clare, in Owney, Co. Limerick. |
 | | Much controversy has centred round the origin and meaning of the name "Ifearnan", and at present there are several irreconcilable theories in the matter. |
| www.esatclear.ie /~dougheff/heffernan/clan_heffernan_History.html (2098 words) |
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