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Last name Kajer (Kajer , Кайер ) , in the world, is a rare cognomen. The cognomen Kajer is habitual in Czechia, where it is a rare surname, Kazakhstan, and the United States, where it is a very rare surname. In absolute terms, it is commonest in the United States, Czechia, and Russia. Likewise, Kajer is the forename as well as the last name.