Etymology tree
Arabic جَنَّة (janna)bor.
Classical Persian جَنَّت (jannat)bor.
Old Anatolian Turkish جَنَّت
Ottoman Turkish جنت
Turkish cennet
Inherited from Ottoman Turkish جنت, from Old Anatolian Turkish جَنَّت, borrowed from Classical Persian جَنَّت (jannat), borrowed from Arabic جَنَّة (janna).
Compare Azerbaijani cənnət and Albanian xhenet.