How to Change the Name of Your Server on Minecraft
Anyone with a computer and an Internet connection can create and run his own server for the online game Minecraft. If you're running such a server and you want to change the name by which it's known on the global Minecraft server list, you can edit a single line in your server's configuration file.
Navigate to the location on your hard drive where the Minecraft server files are stored. This is wherever you extracted the "minecraft-server" ZIP archive when you first installed the server. Open the "minecraft-server" folder.
Double click the "server" file. If there are two such files, try one first, then the other -- one of them will be blank, and you can close and ignore that one. If you're prompted to select a program to open the file with, choose a simple text editor like Notepad or TextEdit.
Find the line in the file beginning with "server-name=". The text after it is the name of your server. This must be a single line of text, but can include spaces and most special characters -- if you experience trouble with a character in your server name, try adding a backslash ("\") before the character.
Open the "File" menu, click "Save," and then close the text editor.