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Cognomen Mordan (Mordan
, 莫尔丹
, Мордан
) , all over the world, is quite a rare last name. The cognomen Mordan is habitual in the Dominican Republic, where it is quite a common surname, Belarus, where it is quite a rare surname, and Estonia. Not in comparison with a country's population, it is commonest in the Dominican Republic, the United States, and Ukraine. Much less frequently, Mordan is the forename as well as the last name.