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Surname Yerko (Yerko , Ерко , Єрко ) , in the world, is quite a rare family name. The cognomen Yerko is habitual in Ukraine, where it is quite a rare surname, Chile, where it is a rare surname, and Belarus. Measured by absolute frequency, it is commonest in Ukraine, Russia, and Chile. Likewise, Yerko is the forename as well as the last name.
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