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Cognomen Tonko (Tonko , Тонко , トンコ) , in all the world, is quite a rare last name. The family name Tonko is habitual in Eastern Europe, particularly Moldova, where it is quite a rare surname, Belarus, and Romania. Not in comparison with a country's population, the name is most common in Nigeria, Romania, and Belarus. Also, Tonko is the forename as well as the last name.