Jowett: aiedes

Soc. Poseidon is Posidesmos, the chain of the feet ; the original inventor of the name had been stopped by the watery element in his walks, and not allowed to go on, and therefore he called the ruler of this element Poseidon ; the e was probably inserted as an ornament. Yet, perhaps, not so ; but the name may have been originally written with a double l and not with an s, meaning that the God knew many things (Polla eidos). And perhaps also he being the shaker of the earth, has been named from shaking (seiein), and then p and d have been added. Pluto gives wealth (Ploutos), and his name means the giver of wealth, which comes out of the earth beneath. People in general appear to imagine that the term Hades is connected with the invisible (aeides) and so they are led by their fears to call the God Pluto instead. CRATYLUS