[agahnim]

I looked around the web for a good hour before I stated sifting through my phone. If you don't like your default headset or stereo bluetooth names (automatically generated by the device) Go to
User/Library/Preferences and edit com.apple.MobileBluetooth.devices.plist

Under the name key you will be able to update the names. I tried this a few times and it seems respringing isn't enough, the iphone needs to be rebooted after the you upload the file.