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Surname Iakub (Якуб , Iakub , Иакуб ) , in all the world, is quite a rare family name. The cognomen Iakub is characteristic of Kyrgyzstan, where it is quite a rare surname, Bulgaria, and Ukraine. Measured by absolute frequency, it is commonest in Ukraine, Russia, and Kyrgyzstan. More frequently, Iakub is the forename as well as the last name.