The problem is there is no E in the Rune set, the only E is our egyptian origin elder rune that forms KU. So we are looking at (Ku)-it-(a)r as our rune set. And we know it is only in the proper form as AR-KU-it (or Ar-KU-ti).
So Etir is originally Kuare?
The answer is: Perhaps. This time the TI elder rune is inverted to IT. R is also bereft of its companion A and shuffled to the end of the word rather than anchored to the companion KU.