Well u need somethin that is epic! People dont want to join servers that have crappy names....although some of the popular ones do. Dont make any "craft" servers. (Ex. Potatoecraft Treecraft Nethercraft etc) U need something amazing that will fit the theme of ur server.Just a tip!
Its pretty easy to think of a name! It might take 10 mins. Just think of two words that have to do with your server, and put them together! A good example is a server called ImagiCraft it is creative mode! Imagination and Craft! Or you could do something like me that just sounds cool such as Loading Chunks! Have fun, and enjoy the server!