Computer name changes after security update

We installed the latest security update for OS X 10.5.8 and after installation the computer name was automatically changed. It was "Name (2)". After the update it magically became "Name (3)". It becomes very confusing because we share this computer's printer with a Macbook and it can't find the shared printer after this happens. Is this normal? It has happened after two security updates.

This is how it SHOULD be. When you try to rename a Mac in a LAN to a Computer Name which is already given to another Mac in the LAN, Mac OS X will suggest to add a number to the name you tried. When you rename the Mac to this Computer Name before you connect to the LAN Mac OS X will add the number automatically.
But the problem this thread is about (imho) is that Macs with UNIQUE Computer Names in the LAN, unexpectedly add a number, when there is for sure no other computer with that exact name in the LAN.
I can witness this behavior round about two to three times in a month in our network of over one hundred Macs.
By the way: Not only the Computer Name will change but the Local Hostname too.
Computer Name: "Example Name" -> "Example Name (2)"
Local Hostname: "Example-Name.local" -> "Example-Name-2.local"
This looks more like a bug in the system than an operating error.
Any suggestions anyone?

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