From Irish Names and Surnames 1923
Mac GIOLLA EARNÁIN—IV—M'Ellerinane, MacAlernon, MacClearnon, MacClernon, MacClarnon, MacClernand, MacLernon, MacLarnon, MacLorinan, MacLarenon, MacLarinon; 'son of Giolla Earnáin' (servant of St. Ernan); the name of an old Co. Down family who, in the 12th century, were chiefs of Clann Ailebra. At the end of the 16th century, it was still common in that county, but was then also found in parts of Connacht; also a Scottish surname.
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