Conversation so far:
When did Voltaire change his name?
The author adopted the name Voltaire in 1718, following his incarceration at the Bastille.
Why did Voltaire decide to change his name?
In a letter to Jean-Baptiste Rousseau, Voltaire writes, I was so unhappy under the name of Arouet, primarily so as to cease to be confused with the poet Roi.“
Why was Voltaire incarcerated in Bastille?
One satirical verse, in which Voltaire accused the Régent of incest with his daughter, resulted in an eleven-month imprisonment in the Bastille.

Question: How did he choose the name Voltaire?
Self-contained rewrite: How did Voltaire choose his name?