Kirby, ó Ciarmhaic, Mac Geirble A Gaelic surname derived from Ciarmhac meaning ‘black-son’. A sept who were anciently chiefs of Eoghanacht Aine, the district lying around Knockany in East Limerick until the time of the Cambro-Norman Invasion. In Mayo Mac Geirble from whom the townland of Carrowkeribly in the Parish of Attymas, is so called. In Connacht ó Coirbín may be so translated. In 1890 Kirby was principally found in Mayo, Kerry and Limerick, and the estimated number of bearers was 1,480.