Cognomen 克凡 (克凡 
, Kefan 
, Khvan 
) , around the world, is quite a rare family name. The family name 克凡 is characteristic of Uzbekistan, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Lithuania. Not in comparison with a country's population, this name is the most popular in Uzbekistan, China, and Russia. Likewise, 克凡 is the forename as well as the last name.