sa loginname being hacked

From: Pipo (Pipo_at_home.com)
Date: 10/16/05 

Date: Sun, 16 Oct 2005 16:41:22 +0200

Hi,

Is there a way to change the sa as loginname?
At work we are getting haked by 'brut-force', every second we are beinbg
attacked with sa and a password.
It's a matter of time when the password will be hacked, so changing the
password isnt a solution.
If we also can change the sa loginname we will be better of.
Or is there something else we can do to prevent the hackers to get our sa
password?

Many thanks