Molloy is an Irish surname that originated from the Gaelic name O’Maolmhuidh, meaning “descendant of the devotee of St. Maelruain”. The Molloy family was historically associated with the County Offaly and nearby areas of Ireland. Famous Molloy’s include Irish politician and diplomat, Declan Molloy, and Australian Olympic medalist swimmer, John Molloy. Today, the Molloy surname can be found worldwide, with a significant presence in the United States, Australia, and Canada.