[UnoriginalGuy]

You have two choices, meaningful names (e.g. "web server," "primary database") or meaningless names (e.g. "server1," "server2," "James," "Bob," "Sarah," etc).

A lot of people recommend AGAINST meaningful names since attackers can use them to better target their attacks (although arguably it is normally trivial to figure out what is what anyway).

If you're going to have meaningless names then I just leave the default (e.g. rack123.server456) since no matter if you use planets, characters, or toys you'll still ultimately end up using its function to describe it or its IP address anyway.

Realistically your servers and their purpose should be tracked internally via some kind of system (be it Google Apps Spreadsheet, intranet page, resource tracking system, or similar). Which makes the actual host name meaningless.