In college our data systems ran various vaxen boxes, and there were few enough that they used planet names. Distinct, easy to remember, unlikely to clash with any other terminology. And had their needs grown beyond the 8 non-Earth planets (Earth wasn’t used, and Pluto was still a planet at the time) they could simply begin using the names of moons and other well know rocks flying about the solar system.

In my own personal home setups I’ve followed the convention of choosing a from a religious pantheon the name of a god whose role most approximated— very loosely— whatever the system is going to be used for. I had a Hephaestus for a while that was a workhorse of a machine where I would work on special projects, etc.