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Cognomen Firth (Firth , 弗斯 , Ферт , along with others...) , all around the world, is a common last name. The family name Firth is characteristic of Cayman Islands, where it is quite a common surname, Isle of Man, and the United Kingdom. In absolute terms, it most frequently occurs in the United Kingdom, the United States, and Australia. Very seldom, Firth is the forename as well as the last name.