Is there any in-universe explanation of where the name Yana came from?
Did the old professor take this name because of what the Face Of Boe had said to the Doctor
“You are not alone”, the acronym of which is “Yana”
? Or did the Face Of Boe say this because the professor would take on this name,
billions and billions of
Or, was it all a pure coincidence and did the Doctor just happen to be reminded of what Boe had said, triggered by professor Yana's name?