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Cognomen Illich (Illich , Ильич , Илич ) , all over the world, is quite a rare last name. The surname Illich is habitual in Kazakhstan, where it is quite a common surname, Armenia, where it is quite a rare surname, and Kyrgyzstan. In absolute terms, the name is most common in Kazakhstan, Russia, and Belarus. Much less frequently, Illich is the forename as well as the last name.