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Cognomen Dorgan (多根 , 도건 , Dorgan ) , in the entire world, is quite a rare last name. The cognomen Dorgan is characteristic of Ireland, where it is quite a common surname, Moldova, where it is quite a rare surname, and New Zealand, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in the United States, Ireland, and the United Kingdom. Also, Dorgan is the forename as well as the last name.