The O'Reilly Clan is a prominent Irish family with roots in County Cavan, Ireland. They are part of the Gaelic nobility and trace their lineage back to the 12th century. The clan's name is derived from the Gaelic "O'Raghailligh," meaning "descendant of Raghailligh." Historically, the O'Reillys were known for their leadership and influence in the region. Throughout the centuries, the O'Reilly Clan has produced notable figures, including military leaders and politicians. The clan's legacy is celebrated in various cultural expressions, including music and literature, reflecting their significant role in Irish history. Today, the O'Reilly name is recognized worldwide, with many descendants living in different countries.