Madadhan is an Irish name commonly anglicised as Madden and Madigan. Whilst originally a forename, it also became the surname Ó Madadhan, meaning "descendant of Madden".
Notable people with the surname Ó Madadhan include
Ambrose Ó Madadhan, first Prior of Portumna Priory Anmchadh Ó Madadhan, Chief of the Name, died 1636 Breasal Ó Madadhan, Lord of Síol Anmchadha and Chief of the Name, died 1526 Cathal Ó Madadhan (died 1286), King of Síol Anmchadha Diarmaid Cleirech Ua Madadhan (died 1207), King of Síol Anmchadha Diarmaid Ua Madadhan (died 1135), King of Síol Anmchadha and Uí Maine Domhnall Ó Madadhan, chief of Síol Anmchadha, fl. 1567 – after 8 March 1611 Eoghan Carrach Ó Madadhan, Chief of Síol Anmchadha, fl. 1451 Eoghan Mór Ó Madadhan, Chief of Síol Anmchadha, fl. 1371–1410 Eoghan Ó Madadhan, Chief of Síol Anmchadha, fl. 1314–1347 John Ó Madadhan, Lord of Síol Anmchadha and Chief of the Name, died 1556 Madudan Mór Ua Madadhan, King of Síol Anmchadha, died after 1158 Madudan Óg Ó Madadhan (died 1235), King of Síol Anmchadha Madudan Reamhar Ua Madadhan, Chief of Síol Anmchadha, 1069–1095 Melaghlin Ua Madadhan (died 1188), King of Síol Anmchadha Murcadh Ó Madadhan, Chief of Síol Anmchadha, died 1451 Murchadh Ó Madadhan, King of Síol Anmchadha, died 1327 Murchadh Reagh Ó Madadhan, Chief of Síol Anmchadha, died 1475 Owen Ó Madadhan, Lord of Síol Anmchadha and Chief of the Name, fl. 1475 Richard Ó Madadhan, Prior of Portumna Priory in 1691
See also Madden (surname), a page for people with the surname Madden Maddin, a page for people with the surname Maddin