Need good Necron Names for my Doomsday Arks

So these two DDAs were two of the first models I bought (they were pre owned hence the different colors) and they are by far my most destructive units between them they have killed several tanks and even knights in one turn and have helped tremendously in tableing some of my opponents, one of them on its own (I think it was the black one but I don’t remember) was able to kill 9 deathwatch kill team members out of 10 in a single blast and thusly I would like two names that would work for there pilots something Necron but not something for a crypto or noble any ideas