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Last name Kerna (Kerna ) , in the entire world, is a rare family name. The family name Kerna is characteristic of Estonia, where it is quite a rare surname, Latvia, where it is a rare surname, and Australia, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Indonesia, the United States, and Estonia. Also, Kerna is the forename as well as the last name.