I strive for a list of names that are shorter than 6 characters each. Usually it will follow a theme. In 20+ years of IT I have set up a couple of networks of systems.

Some past themes... Characters of the current book series I am reading. Hunger Games, Star Wars, Star Trek, C. S. Lewis Novels, Tolkien Novels, Louis L'Amour Novels

Trees, plants, flowers, etc...

Clouds

Snakes, birds, etc...

The important thing is to be unique, memorable and thwart the 'cattle' people.