>
> So, if I should take a guess, the words are of Central Asiatic
> origin, from some Nomadic tribe speaking para-IE.
But while I think the "cow" word is (para-)IE -> ST, I still think
*akW- "water" and its relatives are ST -> IE (and many others).
Culturally, it fits the description of the exchange in the posting
above (cows from the west, water management from the east).