The Murphy Surname — a concise, source-driven exploration of Ireland’s most common name. In this episode we trace Ó Murchadha/Mac Murchaidh from its early medieval roots in Leinster and the Uí Cheinnselaig, through Dermot MacMurrough and the Norman era, the penal and famine centuries, the 1798 rebellions, and the global diaspora that carried Murphy to the Americas, Australia and beyond. Along the way we explain the name’s meaning (“sea warrior”), its multiple independent origins across Ireland, key demographic milestones, cultural touchstones (including Murphy’s Law), and notable bearers who shaped modern history and culture. Follow History and Heritage for sourced episodes that connect places, people and identity.