Or when he started to go by August. Maybe in the interests of protecting himself and Emma from ole Queeny, he made up a name from the get go. Also, I can’t imagine anybody believing the kid if he said his real name was Pinocchio. It is also quite possible that August isn’t the name he used in the modern world either; just the one he gave Emma.
I wonder if August was something of a con-artist. Sounded like he had some money to be vacationing and living it up on the other side of the world. I definitely didn’t get the impression he lived an honest life. Then again, maybe he was a writer and he basically wrote new versions of the old fairytales as they really happened… from what little he had learned. (I really doubt this)