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That's questioned. Old East Slavic chronicles had it as Києвъ, Къıєвъ, or Кїєвъ. First recorded version is Hebrew Qiyyōḇ, Greek Κιοάβα, Kioava, Κίοβα, Kiova and Arabic Kūyāba. The etymology from name Kyi is bizarre because in both original sources that name was written as кии. The one from "stick" might be correct but is equally wrong for Kyiv because in the same modern Ukrainian that had the city named Kyiv stick is again кии (btw the stick etymology is supported by Polish language where the name is Kijów, meaning literally "city of sticks" which check outs historically because we know it had very impressive wooden walls).

All the arguments for "Kyiv" sounds like modern folk pseudoetymology (which is not bad per se) but forced for political reasons back into the past. Especially striking that they claim the city was always "Kyiv" but the state it was the capital of is still called as always was "Kievan Rus"!