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Last name Firk (Firk ) , across the world, is a very rare surname. The surname Firk is characteristic of Estonia, where it is a rare surname, Germany, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Germany, Estonia, and the United States. Likewise, Firk is the forename as well as the last name.