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This has not been revealed as of yet. "The Husbands of River Song" shows the Twelfth Doctor & River on their final date before the events of "Silence in the Library" and thus would have been the latest opportunity for him to impart this information. We saw only the beginning of their night on Darillium, however, so he had the whole of the 24-year-long night in which to tell her. He does not tell her his name in "The Wedding of River Song".