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MCKERNAN Family HistoryRecorded in a number of spellings including MacKernan, McKernan, McKearnen, McKiernan, McTiernan, Kiernan and Kernon, this is an Irish surname. It originates from the pre 10th century Olde Gaelic name 'Mac Thighearnain' meaning 'The son of the Lord', a translation which no doubt helped its popularity considerably. The clan or sept originally belonged to Breffny, an ancient province comprising the modern counties of Cavan and Leitrim. Their chiefs were known as the Lords of Teallach Donnchadha, the modern Tullyhunco, in County Cavan, and frequent reference was made to their exploits in ancient Irish Annals from 1250 to 1550. The name is still chiefly found in the Cavan-Leitrim area...
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