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Cognomen Tynan (Tynan , 泰南 , Тайнен ) , globally, is quite a common surname. The last name Tynan is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom. In absolute terms, it is commonest in the United States, Ireland, and the United Kingdom. Much less frequently, Tynan is the forename as well as the last name.