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Cognomen Flank (Flanc , Flank , Flanko ) , around the world, is a rare surname. The family name Flank is characteristic of Sweden, where it is quite a rare surname, Poland, where it is a rare surname, and South Africa. In absolute terms, the name is most common in the United States, Poland, and South Africa. Likewise, Flank is the forename as well as the last name.