PHP Code:
#include <sourcemod>
public OnPluginStart()
{
HookEvent("player_changename", OnNameChanged);
}
public void OnNameChanged(Event event, const char[] name, bool dontBroadcast)
{
int client = GetClientOfUserId(event.GetInt("userid"));
if (client)
{
KickClient(client, "Name changes are not allowed");
}
}