We have servers in two colocation centers. Machines in one center are named after ancient cities ('jericho', 'carthage', 'athens', 'pompeii', etc). The machines in the other center are named after elements ('carbon', 'helium', 'lithium', 'boron').
Each employee gets to name their own desktop, so there's no particular scheme there. My desktop at work is called 'pynchon'. My home computer is named 'barth'. Post-modern American novelists.
