my dictionary at home shows a relationship going back to the latin cuneas-- wedge shaped..

of course it could be wrong.. but it wedge shaped works for the anatomy, and for the (in effect) wedge shaped sea walls, and for the corner blocks in a building, and the money was created on presses that had a wedge shape.. cuniform is made from a series of wedge shaped marks..

If i can i'll pull info from bartleby's but it is open for discussion..