Cogan is a surname of Gaelic origin. Notable people with the surname include:Alma Cogan (1932–1966), English singer Andrew Cogan, 17th-century agent of the English East India Company Barry Cogan (footballer) Barry Cogan (politician) Brian Cogan Charles Cogan (1928–2017), American academic and intelligence officer David G. Cogan (1908–1993), American ophthalmologist Dean Cogan (1826–1872), Irish…