The mystery of The Doctor’s true Gallifreyan handle has lingered around the Time Lord for decades, long wafted away as simply unpronounceable by humans (with their ineffectual mouths that are completely identical to his). One Whovian, though, did coin a theory back in 1995: that The Doctor’s real name is “Doctor”, and that word came to have its Earthly associations with “healer” and “expert” due to his mucking about and saving lives in the past. Twenty years later, lo and behold, River Song explained that this was indeed the case. Coincidence? No. That Whovian in 1995 was one Steven Moffat, and, as showrunner of Doctor Who, he wrote his own theory into canon. Fair play.
Respect, Mr Moffat.