Are you looking for something descriptive of the server/playstyle?
Some thing cute/memorable eg ZeeZerver or ZerverZ?
Or simply trying to be last in an alphabetized list eg ZZZZZZZZZZZZZZZZZZZZZZerver ?
Like he said, yes, a little more info would help a lot.
Depends what server it is, ex: Minigame, Survival, Creative, etc.
Though, if it is a survival server, I'll build off what Scots said, how about ZurvivalCraft?