De Cogán
de COGÁN—XI—de Cogan, Cogane, Cogan, Goggin; Norman 'de Cogan,' i.e., of Cogan, a parish in Glamorganshire. This surname came into Ireland at the time of the Anglo-Norman invasion. Milo de Cogan was the first constable of Dublin. He received, jointly with Robert FitzStephen, a grant of the whole of Co. Cork from Henry II. The name is now pronounced Gogán, sometimes Gógan, and is generally anglicised Goggin in Munster.
Alphabetical Index to Irish Surnames