Family name 克定 (克定 
, Keding 
) , in all the world, is quite a rare cognomen. The surname 克定 is habitual in Germany, where it is quite a rare surname, Sweden, where it is a rare surname, and Denmark. Measured by absolute frequency, the name is most common in Germany, China, and the United States. Also, 克定 is the forename as well as the last name.