Rename of 10.4.5 machine won't stick

We name computers after the employees who primarily use them. "Joe Smith" got a new machine, so the old joe-smith.local was renamed spare-g5.local, and a new machine became joe-smith.local.
The original joe-smith.local is having none of it, however. A few hours after changing the name to "spare G5", it always changes back to "Joe Smith". Since there's already a joe-smith.local on the network, it puts up a global dialog box explaining that it will now be called "Joe Smith (2)".
Curiously, after it renames itself, I can go to the Sharing preference pane and see that though "Joe Smith (2)" is entered in the "Computer Name" field, the explanatory text just below it refers to "joe-smith.local". If I change the name back to "spare G5", then the explanatory text gets into sync again, until the next time the computer renames itself.
There appears to be no difference between renaming with the Sharing pane or via ARD. I looked for a "hostname" line in /etc/hostconfig, found none, and added the "-AUTOMATIC-" line that's usually standard; this also had no effect. Rebooting immediately after changing the name still reflects the name "spare G5"; I have no clear idea of what's triggering the name to change back.
Both the new and old joe-smith.locals are running 10.4.5. Plenty of other machines on the network have been successfully named and renamed since this one started acting up. Suggestions would be appreciated.
G5   Mac OS X (10.4.5)  

When I encountered the problem beta-testing Tiger, engineering pointed out that my main IP address, gotten by the ping command, wasn't displaying in the list of IP addresses shown by the arp -n command—there were also IPs that were unknown, thus rogues. In my case, since I wasn't on a network, but was connected via a router, resetting the router to its defaults and then reconfiguring it, fixed the problem. So, maybe that will give your network admins some info to help solve the problem.

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