Modying the Display Name on Windows 8.1 Pro for a Domain Account

I have a Windows Server 2008 R2 Active Directory server running which has a domain installed on it. Now, I have a Client PC running Windows 8.1 Pro that connects with the domain user account but for some strange reason I can't manage to change the display name on the client PC when the user logs on. I can confirm that it isn't a local account and I have tried to change the display name from Active Directory on the server but unfortunately to no avail. I tried to restart the PC and told the user to log in and out again but again to no avail.

What could the problem be? :/
 
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