Multiple macs showing under Shared in Finder

Hi,
Running Yosemite 10.10 on an iMac 27".
Noticed that I have 19 Pete's iMac (#) showing under Shared in the Finder as per screen shot below. I recall this happening a few OS X versions ago but what's the cause. Is it anything to do with my ISP assigning and changing IP addresses regularly?
Does this matter at all.
All thoughts appreciated.
Pete

I had the same problem on my home network with my MacBook Pro (Retina, Mid 2012).
My home network has an Airport express attached to the cable modem creating the wireless network and an Airport extreme on the other end of the house extending the network. On the network are two Apple TVs, an iMac, my MacBook Pro, a TIVO, and 3 iPhones.
For me the solution involved two steps: first, turning off "Wake for Wi-Fi network access" and "enable Power Nap when plugged into a power adapter" under the Power Adapter Tab of Energy Saver in System Preferences. Next I turned off all the computers on the network, unplugged each Apple TV, and unplugged the airports. I turned back on the airports followed by the Apple TVs and then the computers.
The downside is that back to my mac and find my mac will not work when the macbook is asleep in this configuration.
I worked with Apple support and the case was escalated. They called me back to tell me there was not a fix.
Initially we had turned off "Wake for Wi-Fi network access" and restarted the Airport Express and that made the MacBook Pro stop renaming itself and eliminated all but one of the phantom computers under Shared in the Finder side bar (number 9). But, the remaining phantom computer was driving me nuts.
I found a thread on Reddit that noted:
The problem is because of a bug between Yosemite and sleep servers. These servers reside in Apple TVs and Airports and act as a proxy for a sleeping machine on Wi-Fi. For now the only fix seems to be:
System Preferences --> Energy Saver, and UNTICK "Wake for network access".
Shut down your computer and then cycle the power on your Apple TV/s and/or Airport/s.
Power-up your computer, System Preferences --> Sharing, and rename the "Computer Name" as you wish.
This step is what killed my last phantom computer on the network.
There is an Apple support community thread that details a fix in terminal that will allow wake for network access, but I've not tried that yet. Here is that thread - Yosemite is renaming my computer - why?
Here is the Reddit thread that helped me identify that devices on the network were creating one of the phantom computers - http://www.reddit.com/r/osx/comments/2hxhp9/yosemite_computer_name_changing_for_ some_reason/
And this support community thread was also helpful - Computer name changes incrementally (1, 2, 3...)

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