Ó Lochlainn and Ua Lochlainn are Irish surnames. They are patronymic forms of the personal name Lochlann. [1] The surnames have been borne by several Irish families, such as the Uí Lochlainn, [2] and the Meic Lochlainn. [3]
A variant form of Ó Lochlainn is Ó Lachlainn. [4] There are numerous Anglicised forms of Ó Lochlainn, such as: Laughlin, [5] Lock, Locke, [6] Loftus, [7] Loughlin, [8] O'Loghlen, O'Loghlin, [9] O'Loughlan, [10] and O'Loughlin. [11]