Yes, I have had the same problem with my iMac. Every day when I went to use it that same event occurred for about a month or two.  Then only a couple of times over the next couple of months.  
  
  It may have been an issue with my Verizon router after a power failure.  Over the course of time and another power failure I shut down and restarted several macs, two MS based machines an iPod, three iPhones and three iPods.
  
  Only had the message on the iMac .
  
  Still don't for sure why this happened.
  
  Bobby
  
  --- In apple-iphone@yahoogroups.com, Jon Kreisler <jonkreisler@...> wrote:
  >
  > Every device on my Wi-Fi network has a unique name. AirPort Extreme 7.6.3
  > I try to Wi-Fi sync my iPhone 5 (IOS 6.1.3) to my Mac Pro (Mac OS X 10.8.3,
  > iTunes 11.0.2)
  > Lately, iTunes pops up with a a message, "Computer name is already in use
  > on this network..."
  > It then proceeds to give my Mac Pro a new name, by appending a number
  > within parentheses, or, on subsequent attempts, changing the number in
  > parens.
  > The iPhone then disappears from the device list in iTunes.
  > I quit and restart iTunes, but as soon as I hit the sync button, the same
  > thing happens again.
  > Has anyone else encountered this problem? It would appear that the computer
  > name appears somewhere in network cache, but I can;t figure out where. I
  > have rebooted the AirPort, but the problem remains.
  > Thanks for any insights,
  > Jon
  > 
  > 
  > [Non-text portions of this message have been removed]
  >
  
  
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