SAme here. I learned in high school the correct pronunciation, and I graduated in 1972. It’s Key-ev
IF you are an American and mispronouncing it. If you are over there - it's not pronounced that way.
In 1972 you had zero exposure to the world and you didn't know, perhaps, how a Ukrainian pronounced the name of their own city. Go there and call it "Key-ev" - and see what kind of reception you get.