I know the prefix comes from the authors name, but the NSSomething naming scheme was very unlucky already, KZSomething is even worse.
Anyway, it seems an odd request to make of an apparently Polish person.
Upon review, I made it sound like you were suggesting that it should be changed; but you hadn't, and had only pointed out the contextual awkwardness. I apologize.
kz can thoug also be the TLD/country code for Kazakhstan, there are just a lot of ambiguities in all the human languages and product naming can be a real pain (some car-makers have some experience with especially bad naming :) )
Apple would like to keep two-letter prefixes for their own frameworks: CA for Core Animation, SK for SceneKit, etc.