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Cognomen Ernestus (Эрнст , Ернст , Ernestus ) , all over the world, is quite a rare last name. The cognomen Ernestus is habitual in Kazakhstan, where it is quite a rare surname, Kyrgyzstan, and Norway, where it is a rare surname. In absolute terms, it most frequently occurs in Kazakhstan, Russia, and Kyrgyzstan. More prevalently, Ernestus is the forename as well as the last name.