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Cognomen Сихра (Сихра, Sichra , Sychra ) , in all the world, is a rare last name. The cognomen Сихра is habitual in Czechia, where it is quite a rare surname, Austria, where it is a rare surname, and Germany, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Czechia, the United States, and Germany.