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Last name Leddy (Leddy , 雷迪 , 莱迪 ) , throughout the world, is quite a rare cognomen. The family name Leddy is characteristic of Ireland, where it is quite a common surname, Nicaragua, where it is a rare surname, and the United States. In absolute terms, this name is the most popular in the United States, Ireland, and the United Kingdom. Much less frequently, Leddy is the forename as well as the last name.