Kate Austen’s middle name in Lost is Anne. The character is introduced as one of the survivors of Oceanic Flight 815 and becomes one of the series’ central figures.
Kate’s full name is Katherine Anne Austen, although the show usually calls her simply Kate. Her criminal history, escape from custody, and complicated relationship with Jack Shephard and James “Sawyer” Ford form major parts of her story.
The name is easy to miss because it is rarely used in ordinary dialogue. It appears in character information and official records connected with Kate’s past. It should not be confused with the surname Austen, which evokes the English novelist Jane Austen but has no stated connection to her.
Kate’s background is explored through flashbacks, especially her relationship with her mother, Diane, and her attempt to flee after killing her abusive stepfather. Her middle name is a small continuity detail rather than a major plot point.