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Family name Sheehan (希恩 , Sheehan , شيهان ) , globally, is a common surname. The last name Sheehan is habitual in Ireland, where it is a common surname, Jersey, where it is quite a common surname, and Australia (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in the United States, Ireland, and the United Kingdom. Much less frequently, Sheehan is the forename as well as the last name.