What is the name of House’s fellow known by the nickname “Thirteen”?

House’s fellow known as “Thirteen” is Remy Hadley.

Remy Hadley is a physician who joins House’s diagnostic team after the competition to replace his original fellows. The nickname comes from her contestant number during that selection process, and it remains her most familiar name within the hospital.

Olivia Wilde played Thirteen, whose storylines include Huntington’s disease, ethical decisions, and her complicated professional relationship with House. The character’s medical condition is a major continuing element, but the show does not treat her solely as a diagnosis. A common mix-up is calling her Amber Volakis, another member of the fellowship competition who is nicknamed “Cutthroat Bitch.”