In the Hellboy universe, what was Abe Sapien's birth name?

In the Hellboy universe, Abe Sapien's birth name is Langdon Everett Caul. This name was revealed in the Hellboy comic book series and later confirmed in the films. Langdon Everett Caul was an occult detective who was murdered and later brought back to life through a ritual involving a mystical artifact. As a result, he lost his memories of his past life and adopted the name Abe Sapien.