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Last name Hennessy (Hennessy , הנסי , ヘネシー) , throughout the world, is a common cognomen. The family name Hennessy is habitual in Ireland, where it is a common surname, Bermuda, where it is quite a common surname, and Reunion (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in the United States, Ireland, and Australia. Much less frequently, Hennessy is the forename as well as the last name.