An old County Roscommon name — the family were counted among the twelve Lords of Cruaghan, later lords of Clannconon.
The Finnerty certificate.
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Gaelic Origin · County Roscommon
Finnerty anglicises Ó Fionnachtaigh, a County Roscommon name whose chiefs were counted among the twelve Lords of Cruaghan. The line later held Clannconon, where Teige Óg was the last lord to carry the older form of the name before his son, Charles O'Finnaghty, adopted the surname as it's known today.
A name that changed shape once, from a lord's title to a settled surname, without ever leaving Roscommon behind.
Irish form: Ó Fionnachtaigh
