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Family name Riis (ريس , 里斯 , Riis , and others...) , globally, is quite a common surname. The cognomen Riis is characteristic of Greenland, where it is quite a common surname, Denmark, and Norway (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in Denmark, Norway, and Syria. Much less frequently, Riis is the forename as well as the last name.