[TheSimpleGuy]

ofc I know how to make a changename CMD just as I told in my post.
I will tell you a scenario so we could all understand it.

TheSimpleGuy [1]: Hey, dude, I will change your name.
TheSimpleGuy(1)'s name has been changed to TheSimpleGuy(2)!
TheSimpleGuy(2) [0]: Wow! You changed my name! Let me relog, okay?
TheSimpleGuy [1]: Sure!
TheSimpleGuy(2) left the server.
TheSimpleGuy(2) joined the server.
TheSimpleGuy [1]: WB Bro!
TheSimpleGuy(2) [0]: Dude I can't log in it says I have a wrong password!