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Family name Forth (Fort , 福思 , Forth ) , all around the world, is a common cognomen. The last name Forth is habitual in Saint Lucia, where it is quite a common surname, France, and Czechia (explore the name in all countries). In absolute terms, the name is most common in France, the United States, and Algeria. Very seldom, Forth is the forename as well as the last name.