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Surname Janewski (Janewski , Яневский , Яневски ) , around the globe, is a rare family name. The family name Janewski is characteristic of Bulgaria, where it is a rare surname, Belarus, and Canada, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Russia, Bulgaria, and Canada. Much less frequently, Janewski is the forename as well as the last name.