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All around the world, Firth (Firth , 弗斯 , Ферт , along with others...) is a very rare dominantly masculine, but uncommonly female given name. The forename Firth is habitual in the United States, where it is an extremely rare unisex name, and China, where it is an extremely rare masculine name. Much more prevalently, Firth is the last name as well as the forename.