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Cognomen Bergdahl (Bergdahl
, Barkdull
, Бергдал
) , worldwide, is quite a rare last name. The family name Bergdahl is habitual in Northern Europe, particularly Sweden, where it is quite a common surname, Finland, where it is quite a rare surname, and Estonia, where it is a rare surname. In absolute terms, the name is most common in Sweden, the United States, and Finland.