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Last name Mershin (Mershin , Мершин ) , all around the world, is a rare family name. The cognomen Mershin is habitual in Azerbaijan, where it is quite a rare surname, Estonia, where it is a rare surname, and Russia. Not in comparison with a country's population, it is commonest in Russia, Azerbaijan, and Ukraine. Much less frequently, Mershin is the forename as well as the last name.