Cognomen Koer (Cour 
, Koer 
, Kör 
) , all around the world, is a common surname. The surname Koer is habitual in Jersey, where it is quite a common surname, Denmark, and Turkey. Not in comparison with a country's population, it most frequently occurs in Turkey, Denmark, and France. Very seldom, Koer is the forename as well as the last name.