Spelling is one thing, but no one pronounces it the Ukrainian way (ˈkɪjiu̯) which is somewhat torturous for non-Ukrainian speakers. The best common pronunciation in English that more or less respects English phonetic patterns IMO is "KEE-iv".

Still, people need to respect the fact that each language can create their own variants. English speakers are under no obligation to call Wales "Cymru" or Finland "Suomi". It's fine.