The surname of the protagonist in C.S. Lewis’s Space Trilogy is Ransom.
Elwin Ransom is the central human character of Out of the Silent Planet, Perelandra, and That Hideous Strength. He is introduced as a Cambridge philologist whose knowledge of languages becomes important when he encounters nonhuman civilizations.
Ransom’s role changes across the trilogy. He begins as an abducted traveler, becomes a participant in a cosmic moral conflict, and later acts as a leader opposing destructive scientific and political ambitions on Earth.
The character is sometimes confused with Edward Rolles Weston or Devine, figures associated with the first novel’s antagonistic expedition. Ransom is the trilogy’s recurring protagonist, while Weston and Devine do not occupy that continuing role.