SimpleName:
/name (TAB|CHAT) <nickname>
Permission:
You can change it by accesing the .sk file. Default: name.use
How to install?:
This is a SKRIPT, not a .JAR. Download Skript plugin, put it in "/plugins", reload / restart the server, then put the Name.sk file in plugins/Skript/scripts. After this, do /sk reload all

SimpleName 1.0
Very simple SKRIPT for changing tab name and display name