Gavan Duffy is a compound surname. A list of people with the name include:
C. Gavan Duffy (1874–1958), Canadian politician and judge Charles Gavan Duffy (1816–1903), Irish and Australian editor, politician, and jurist Charles Cashel Gavan Duffy (1855–1932), Australian public servant Charles Leonard Gavan Duffy (1882–1961), Australian judge Frank Gavan Duffy (1852–1936), Australian jurist George Gavan Duffy (1882–1951), Irish politician and jurist Louise Gavan Duffy (1884–1969), Irish nationalist and Irish language enthusiast who founded an Irish language school
See also Gavan Duffy (1874–1958), Canadian politician and jurist. Gavin Duffy (born 1981), Irish rugby player
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