Keys, Keyes, Mac an Chaoich May be of English, Irish, or Scottish origin. The Gaelic surname derived from caoch for Ďa blind maní. A sept who were a branch of the OíReillys of Cavan. Also see MacKay, and MacKee. In 1890 Keys was principally found in Fermanagh and Antrim, and Keyes was principally found in Tipperary and Wexford, and the estimated number of bearers was 1,430. In the United States Keys is the 1,333rd most numerous surname with an estimated 24,750 bearers, and Keyes was the 1,991st most numerous surname with an estimated 16,500 bearers.
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