Computer name changes incrementally (1, 2, 3...)

Dear Apple Friends,
I have an issue that is affecting all the Macs on my home network: 3 MacBooks (wireless) and an iMac (hardwired) connected to an Apple Airport Extreme dual-band 802.11n/a/b/g 5Ghz/2Ghz wireless router. All the Macs are running Yosemite 10.10, I am running firmware v7.6.4 on the Airport (latest version). We have turned on Back to my Mac, File Sharing, and Screen Sharing (all are used pretty regularly) in the Sharing screen.
So here is what is happening...
All the Macs on our network are having their computer names changed with the suffix of (1), (2), all the way to 6 now.
I have tried resetting our Airport router (turn off/on again) and that seems to stop it for a day but then it starts again.
A few days ago, I did a factory reset on the Airport router per the instructions on the Apple website (hold down reset until it blinks constantly) to clear the router. Sure enough, the names started changing again after about a day.
Sometimes, I will change the name back, and it will rename itself again automatically right after I change it. i.e. John's MacBook Pro => John's MacBook Pro (1)
I have gone so far as to reboot every Mac on the network, shutting off the router, then turning it on again, and the issue returns. I am going to try and set up a DHCP reservation next and see if that helps.
Has anyone else run across this? If so, is this a bug or is there something I'm missing here? Thanks you for your time.

To "fix" I:
First, I turned off networking which was WiFi in my circumstance.
Next, I named my computer back to the original desired name in the "Sharing" system preference without the (n).
Then I added a "--no-namechange" parameter in the /System/Library/LaunchDaemons/com.apple.discoveryd.plist.
Unloaded and loaded the deamon:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist
Last, I reconnected to the network.
Now when I connect to the network instead of getting something like below in the Console.app:
"discoveryd: Basic Bonjour Changing computer name from <hostname> to <hostname> (2)"
This appears in the Console.app:
"discoveryd: Basic Bonjour Would have changed computer name from <hostname> to <hostname> (2), but it's disabled"
I could not find a Yosemite bug filed https://bugreport.apple.com/, but this site helped me hack my solution:
http://www.insanelymac.com/forum/topic/301118-computer-name-changing-constantly- two-or-one-network-interfaces-enabled

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