I do random things like the names of vegetables or colors or car brands. But right now I am using Borg designations. Not in use, but an example would be eleven@twelve. Although not a server, I tend to add the capacity to USB drives. They are issued a number and I keep track of them. When one dies it gets deleted from the inventory list. So it would be IssueNumber-capacity 103-04G.
We are having a great time over here in the Fediverse, and they are jealous. So we will continue to have a blast, just to piss them off.