If memory serves, the EVA moniker came about during the period of Compaq's ownership of DEC's StorageWorks hardware but I think the technology, if not the name, may have already been well along in the product development pipeline when Compaq took over DEC.
I still remember having to stay late one night while someone from DEC, er, Compaq field service came in not long after the takeover. I thought that someone had made a call to replace a component but it turned out that the reason for the visit was to put "Compaq" stickers over all the "Digital" logos on the equipment in the data center. The funny thing was that there were several different sizes of the Digital logos but Compaq had properly sized stickers for every one. Compaq innovation at its best.