Irish: from Ó Muirgheasa ‘descendant of Muirgheas’ a personal name meaning ‘sea valour’. However according to MacLysaght this surname is also derived from the Norman name de Marisco.
Irish: from Ó Muirgheasa ‘descendant of Muirgheas’ a personal name meaning ‘sea valour’. However according to MacLysaght this surname is also derived from the Norman name de Marisco.