The eldest of four children of Joseph Charles Duncan, a banker, and Mary Isadora Gray, he was the brother of Isadora Duncan and Raymond Duncan.
Isadora Duncan | Duncan Sandys | Arne Duncan | Duncan, British Columbia | Seymour Duncan | Sandy Duncan | Iain Duncan Smith | Duncan Hines | Duncan Edwards | John Duncan | Duncan MacLeod | Duncan | John Duncan (artist) | Augustin Pyramus de Candolle | Adam Duncan | Raymond Duncan | Duncan Patterson | Duncan Hunter | Duncan Grant | Duncan B. Forrester | Augustin Ehrensvärd | Arthur Duncan | Adam Duncan, 1st Viscount Duncan | William Duncan Strong | Sankt Augustin | Mal Duncan | Duncan Sheik | Duncan Jones | Duncan Fletcher | Duncan Fallowell |