Exists a means to rename an audio card in Mac OS X?
The Sound Card's name originates from the Device itself, which "releases" its name. The os reviews the name from there. I do not think you can rename it, yet you can most definitely most likely to / Applications/Utilities/Audio MIDI Setup and also create an Aggregate Audio Device (with the names you desire) and also select the input/outputs of each.
As an example, you can create your earphones similar to this :