From Irish Names and Surnames 1923
Mac COLLA—IV—M'Colla, M'Collagh, M'Colly, M'Colle, MacCulla, MacCullagh, MacCollough, MacCullough, MacColl, MacCull, &c.; 'son of Colla' (a common personal name among the MacDonnells and Mac Sweeneys); a scattered surname; in the spoken language, sometimes made Mac Collach.
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