Changing the Computer Name... when it's greyed out in the Sharing Prefs?

Okay, here's a weird one.
Using Carbon Copy Cloner 3, I recently cloned the hard drive on my iBook G4 (OS X 10.5.4)—it was dying and I needed to swap in a new one. I made the swap, using the cloned version of my old drive, and everything was wonderful.
The new drive is great. The only artifact of the change is that when I see my iBook on a network, instead of the original computer name (let's call it +David's iBook+ for argument's sake), I get +David's iBook_1+. When I go to the Sharing Preferences pane, in the field where I should get my good old iBook's name, I get that _1 tacked on again, and instead of being able to edit it, the name is greyed out!
The hostname is fine. I can edit that. But the computer name refuses to be changed by any of the normal methods. I could probably go into Terminal and edit the /Library/Preferences/SystemConfigurations/preferences.plist file. But I get the feeling that there's something else going on here.
Any thoughts?
(I'm now wishing I'd just restored using Time Machine. Old habits die hard.)

Thanks! I should have mentioned that I'd already tried that. Several times. There are no other computers with the same name as mine on either my home or office network.
I can click on the "Edit" button and change the name to "David.local" or whatever, and it'll stay that way—but it doesn't show up on the LAN. When I look for the computer over the network—either using Bonjour or the Apple-K command in the Finder—it shows up with its old name. If I try to connect with "David.local" (or whatever), I get an error saying the server can't be found.
Since posting, I've also tried logging in as the root user and changing it there. No dice.
I had to replace the hard drive (the reformatting that caused me to clone the disk in the first place turned out not to solve the problem, which was that the hard drive was failing); for a week I was using an external drive clone as the startup disk for my iMac. It let me change the name there just as it should have. No more +David's iBook_1+. Woohoo!
But when I copied the disk back onto my brand new internal drive... There it was again. Greyed out. Can't get at it.
Grrrrrr.
Again, it's not a big deal; I want to change the name so that it fits the naming convention at my office. But it's really bugging me! (Obviously.)
I suppose I could reinstall and migrate the accounts and apps over....

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