Exodus 3 :14 And God said to Moses, "I am tht i am." And He said "You shall say to the children of Israel I WAS BEING/I AM BEING/I WILL BE BEING ("eHYeH: Qal imperfect) has sent me to you."
So pronounced phonetically " eh-yeh " But probably best pronounced in any language as that language's equivalent of " I WAS BEING, I AM BEING and I WILL BE BEING " or "the Ever-existing One.