Last name Karby (Karby 
) , worldwide, is a rare cognomen. The family name Karby is habitual in Denmark, where it is a rare surname, Spain, where it is a very rare surname, and Norway. Not in comparison with a country's population, this name is the most popular in the United States, Spain, and the United Kingdom. Much less frequently, Karby is the forename as well as the last name.
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