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Last name Kaelin (凯林 , Kaelin , 凱林) , in the entire world, is quite a rare family name. The cognomen Kaelin is habitual in Western Europe, particularly Liechtenstein, where it is quite a common surname, Switzerland, where it is quite a rare surname, and Austria, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in the United States, China, and Switzerland. Also, Kaelin is the forename as well as the last name.