Let's suppose you groups your apps into different folder.. IE Goolge apps in a Google Folder. When you have two, three or more Google apps within the folder (Tap/drag an app on top of another app to create a folder) you can then tab the to open the folder and change its's name.
In this case, check to see if you already have a folder to test this with. Open an app group of app's within a folder and tap the folder's title and simply change the name.