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According to "The Name of the Doctor", River made him tell her his name, but the circumstances and how she persuaded him remain unknown. That said, the Doctor was made aware that River knows his name in "Silence in the Library"/"Forest of the Dead", and her knowledge of the name was instrumental in leading to the actions that saved Donna Noble's life (never mind his own), and he also knew there was one circumstance in which he would have told her his true name. In "The Wedding of River Song" the Doctor appears to tell her his name as part of their marriage ceremony, however this is a ruse and he tells her something else. Exactly when he informed her of his name, and whether it actually had anything to do with the two being married, remains unknown.