My old company used Greek and Roman gods and heroes. Hermes01 was the mail server, for example (because Hermes was the messenger of the gods). I don’t remember all of them, but we had demeter (esx clusters), zeus (file servers iirc), Ares (backup servers), and other server names like that.
https://www.upworthy.com/bartender-explains-why-he-swiftly-kicks-nazis-out-of-his-punk-bar-even-if-theyre-not-bothering-anyone