Cognomen Kaljan (Калжан 
, กัลยาณ 
, Kaljan 
) , all over the world, is a very rare surname. The family name Kaljan is characteristic of Kazakhstan, where it is a rare surname, Kyrgyzstan, where it is a very rare surname, and Russia. Not in comparison with a country's population, it is commonest in Russia, Kazakhstan, and Thailand. Predominantly, Kaljan is the forename as well as the last name.