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Last name Duggan (Duggan , دوغان , ダガン) , globally, is a common family name. The cognomen Duggan is habitual in Ireland, where it is a common surname, British Virgin Islands, where it is quite a common surname, and Guernsey (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and Ireland. Much less frequently, Duggan is the forename as well as the last name.