I found this in another thread, not sure it will help but might point in the right direction.
"Battlegrounds....
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I love this mod for healing, but in battlegrounds it would be of no use for the simple fact that ever character has the _servername after there character name.
This is done so people from different servers, but with the same name are not counted as one person or something like that from the test forums.
Is there anyway to get the server name for healing?"
This is from the Darq group/raid thread.
Mao.