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Family name Bolko (Болеслав , Bolko , Болько ) , globally, is a rare cognomen. The family name Bolko is habitual in Slovenia, where it is quite a rare surname, Belarus, where it is a rare surname, and Poland. In absolute terms, the name is most common in Slovenia, Poland, and the United States. More prevalently, Bolko is the forename as well as the last name.