canon novel Tarkin ger ett svar på den här frågan: < stark> det var inte offentlig kunskap om att Vader ursprungligen var Anakin Skywalker. Bara ett mycket litet antal personer visste, och många av dem var tvungna att räkna ut det utan att bli höra.
Tarkin själv blev aldrig berättad vem Vader var (s. 70):
Tarkin had long nursed suspicions about who Vader was beneath the
black face mask and helmet, as well as how he had come to be, but he
knew better than to give open voice to his thoughts.
Tarkin utarbetade att Vader ursprungligen var Anakin, men bara på grund av hans nära samarbete med Palpatine och Vader, liksom det faktum att Tarkin tidigare arbetat med Anakin under Klonkrigen (s. 73):
Very early on in their partnership—soon after both had been introduced to the secret mobile battle station—Tarkin grew convinced that Vader knew him much better than he let on, and that behind the bulging lenses of his face mask, whatever remained of Vader’s human eyes regarded him with clear recognition. More than anything else it was those initial feelings that had provided Tarkin with his first suspicion as to Vader’s identity. Later, observing the rapport the Dark Lord shared with the stormtroopers who supported him, and the technique he displayed in wielding his crimson lightsaber, Tarkin grew more and more convinced that his suspicions were right. Vader might very well be Jedi Knight Anakin Skywalker, whom Tarkin had fought beside during the Clone Wars, and for whom he had developed a grudging appreciation.
Romanen ger en lista över rykten om Vaders ursprung och identitet (s. 73):
It was that genuflecting obedience, the steadfast devotion to execute whatever task the Emperor assigned, that had given rise to so many rumors about Vader: that he was a counterpart to the Confederacy’s General Grievous the Emperor had been holding in reserve; that he was an augmented human or near-human who had been trained or had trained himself in the ancient dark arts of the Sith; that he was nothing more than a monster fashioned in some clandestine laboratory. Many believed that the Emperor’s willingness to grant so much authority to such a being heralded the shape of things to come, for it was beyond dispute that Vader was the Empire’s first terror weapon.
Förutom de personer som anges i frågan kan vi bara bekräfta att Tarkin visste. Och eftersom Tarkin var en väldigt högsta individ (Grand Moff och befälhavare för Death Star) är det möjligt att Tarkin var den enda andra personen som visste.