[_cbdev]

For systems consisting of "many" (5+) servers all providing more or less the same functionality, I usually just go with numbering them (s1 .. sN).

For fewer and more specialised machines I'll think of something I like, my private machines are named after the deities of the Cthulhu Mythos (azathoth, cthulhu, shub, hastur, lloygor, nyarlathotep), while some of our Office servers get their names based on dinosaurs and other prehistoric animals.