Last name Киффер (Kieffer 
, Киффер) , all around the world, is a common cognomen. The family name Киффер is habitual in Luxembourg, where it is a common surname, France, where it is quite a common surname, and Cyprus, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in France, the United States, and Germany. Very seldom, Киффер is the forename as well as the last name.