Killeen, Killen, ó Cillín A Gaelic surname meaning descendant of Cillín (according to Woulfe a diminutive of Ceallach meaning ‘war’). Little definitive information available on this surname. In 1890 Killeen was principally found in Clare, Mayo and Offaly, and the estimated number of bearers was 1,790. Killen was principally found in Antrim and the estimated number of bearers was 630. In the United States Killen is the 8,561st most numerous surname with an estimated 2,750 bearers.
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