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Family name Geslin (Geslin , جيسلين, ジェラン) , globally, is quite a rare cognomen. The cognomen Geslin is habitual in France, where it is quite a rare surname, Belgium, where it is a rare surname, and Honduras. Measured by absolute frequency, it most frequently occurs in France, the United States, and South Africa. Very seldom, Geslin is the forename as well as the last name.