James, Jim or Jimmy Duncan is the name of:Sir James Duncan, 1st Baronet (1899?1974), British politicianJames Duncan (1887?), American athleteJames Duncan (1756?1844), American politician from PennsylvaniaJames H. Duncan (1793?1869), American politician from MassachusettsJames L. Duncan (1913?2000), American religious leaderJim Duncan (1946?1972), American football playerJimmy Duncan (1869?1953), New Zealand rugby union footballer,