Before revision: It is generally considered to be an early borrowing from Proto-Germanic kuningaz, a form regarded by Germano-centric linguists and convention to be borrowed by Finnish and Estonian , yet, wihout reasons to claim that it was the other way around, one need to be aware it appears to cognate to Proto-Finnic *kuningas as well as well as possibly Old Turkic: 𐰴𐰍𐰣 Kaɣan, relating to the Mongolian Mongolian:ᠬᠠᠭᠠᠨ; Khaan or Khagan.
After revision: It is generally considered to be an early borrowing from Proto-Germanic kuningaz, a form also borrowed by Finnish and Estonian