The last name O'Riordan is of Irish origin. It is an anglicized form of the Gaelic surname "Ó Riordáin," meaning "descendant of Riordán." The name Riordán itself is a diminutive of the Old Norse name Ragnvaldr, meaning "ruler's counselor." The O'Riordan surname is primarily found in Munster, a province in southern Ireland.
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The O Riordan surname is of Gaelic origin, with its roots in County Cork, Ireland. The name comes from the old Gaelic name "O Rioghbhardain", meaning "descendant of Rioghbhardan". The O Riordan clan were once a prominent family in the region and were known for their involvement in politics and military affairs. The O Riordans were considered a sept of the larger O'Brien clan, with ties to the Kingdom of Munster. Many O Riordans emigrated to countries such as the United States, Canada, and Australia during times of hardship in Ireland, spreading the surname across the globe. Today, O Riordan is a relatively rare surname, but those who bear it can trace their ancestry back to the ancient Gaelic nobility of Ireland.
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