Given what the U.S. has done to Taiwan for calling its currency the New Taiwan Dollar, you should reconsider. Do you really want to have your U.N. seat turned over to a competing website, see your U.S. Embassy closed and turned into a mere "American Institute", and have to rely on backdoor negotiations for foreign aid?
Or look at Hong Kong. Once a proud British protectorate, it was abandoned to the benevolent ministrations of China for the crime of calling its currency the Hong Kong Dollar. (Worse yet, they pegged their exchange rate, so with the slide of the U.S. Dollar, they've really gotten screwed.)
It's just not worth it. Call your e-currency something imaginative, like Flooz(TM) or Beenz(TM). Users will think that's adorable and will flock in your general direction.