Local host name message pops up on start up

I've started getting message on start up saying "local host name is already in use, do you want to change"
this just began happening.
what does this mean and how can i fix it from poping up?
thanks

Hey R%%^Y,
Thanks for the question. It sounds like another computer on your network may have a similar local hostname. You can change your hostname in System Preferences > Sharing:
OS X Mavericks: Find your computer’s name and address
http://support.apple.com/kb/PH13790
Local hostname: Your computer’s local hostname, or local network name, is displayed on your local network so others on the network can connect to your Mac.
Your computer’s local network name is displayed beneath the computer’s name at the top of Sharing preferences.
The local network name is your computer’s name with “.local” added, and any spaces are replaced with hyphens (-). For example, if your computer’s name is My Computer, your local network name is “My-Computer.local.” Local network names are not case sensitive, so “my-computer.local” is the same as “My-Computer.local.”
Thanks,
Matt M.

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I've checked your other thread. I fear, you misunderstood my first posting. There I said:
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Frequentlly, we get "this computer's local host name on the network is changed to 1234567654-1 because it determines that the original host name "is already in use." This doesn't make network peripherals and communication between our two computers very easy because we need to constantly change it in Sharing to share the printer etc... . When we get the notice, we change the name (number) back to the original and it seems fine for awhile and then returns...
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I've had the same or a similar issue. My computer was constantly renaming itself with a (2) every time it booted, after a system lockup. I tracked the issue down to CD/DVD sharing... when turned off the problem went away.
When CD/DVD sharing was on, I could not change the name back to the original version, it would get rejected and immediately set back to the version with "(2)", displaying the message:
+The name of your computer "Name" is already in use on this network. The name has been changed to "Name (2)" automatically.+
With CD/DVD sharing turned off, I could name my computer whatever I liked, even back to the original name. Turning DVD/CD sharing back on again would instantly rename my Mac. It's very persistent bug!
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http://tech.karbassi.com/2007/11/06/leopard-turn-off-bonjour-mdnsresponder/
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sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
To turn it back on:
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
Toggling Bonjour (mDNSResponder) forced a reset of something on my system somewhere, and now I no longer see the issue on reboot, even with CD/DVD sharing turned on. I can turn sharing on and off at will, and my computer is never renamed. Success!
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Local host name message pops up on start up

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