McGilliganMcGilligan is an Irish surname. It derives from Mac Giollagáin. Notable people with the surname include:Brian McGilligan, Irish hurler and Gaelic footballerJanak Palta McGilligan, Indian social workerPatrick McGilligan (Fine Gael politician), Irish lawyer and politicianPatrick McGilligan (biographer), American writerPatrick McGilligan (Irish nationalist politician), Irish nationalist politician