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Family name Soudan (Soudan , Soldan , Soden ) , in the entire world, is a common cognomen. The last name Soudan is habitual in Croatia, where it is quite a rare surname, Czechia, and Romania. Measured by absolute frequency, the name is most common in the United States, France, and the United Kingdom. Much less frequently, Soudan is the forename as well as the last name.