Keane, Mac Cahan(e), ó Céin Keane is an anglicisation of two Gaelic surnames. ó Céin meaning descendant of Cian, which personal name meant ‘ancient, enduring’. A sept who were chiefs of a district bordering the river mahon in Waterford. A sept in Derry, difficult to distinguish from ó Catháin. Mac Catháin meaning son of Cathán, which means ‘battler’. A sept of Clare who were co-arbs of St. Senan at Inis Cathaigh. In 1890 Keane was the eighty-fifth most numerous surname, the estimated number of bearers was 9,000, and the surname was chiefly found in Galway, Clare, Kerry and Mayo. In the United States Kean is the 7,017th most numerous surname with an estimated 5,500 bearers.
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