 It is now common knowledge that Clark Kents Earth parents were  named Jonathan and Martha. However, in the first episode, "Superman  on Earth", Kents parents were named Eben and Sarah. This is because  the comics themselves were inconsistent with the Kents given names  until the characters became major players in "Superboy" comics  stories at about this same time. The names Sarah and Eben were first  used in the novel The Adventures of Superman (1942) and in the first  Superman serial.