Darth Vader's identity was a secret that he guarded with extreme secrecy. Known throughout the galaxy only as the Emperor's dark enforcer, few people knew his true identity of Anakin Skywalker. Many thought the renowned Clone Wars general and decorated Jedi perished during Order 66, killed alongside the rest of the members of the Jedi. The secret of Vader's identity would have granted him an air of mystery, though it was one that a handful of people managed to learn.
Source：https://www.cbr.com/ahsoka-baylan-skoll-darth-vader/
