Do you remember Windows 7 and Windows Server 2008 R2 and that nifty option which allows you to change your network name inside the Network and Sharing Center? Well, Windows 8 and Windows Server 2012 still come with the Network and Sharing Center but lack the option to rename the network.
Fortunately for us, there is a workaround. What you have to do, is open the registry editor (go to the Modern UI interface and start typing "regedit") and then navigate to:
There, you will find a lot of subfolders that are just ID numbers. Find the one that corresponds to the network you are looking for by matching the current network name with the entry inside "ProfileName" and "Description" (in most cases they are the same). Now, to rename your network, you have to change the "ProfileName" entry with your own name. I like to change the description too, but so far I didn't see where it is applied to. Make sure you don't change anything else unless you know what you are doing.
WARNING: The steps above tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. If you don't know what you are doing back off from trying.