I have never heard of
Borut... maybe you're right and it is related to
Boris, but then it can't be related to Borat (assuming that this names exists at all). Not all similaar-sounding names/words are necessarily related. Kazakh language is not related to Russian, as Kaleko points out, it's Turkic, and I see no way Kazakh names can be related to Russian names.
___________________________________________
Pureness rules the world