Final answer:
Joe Rantz's daughter is named Judy Willman. She has played a key role in preserving her father's legacy and the story of the 1936 U.S. men's Olympic rowing team.
Step-by-step explanation:
The name of Joe Rantz's daughter is Judy Willman. Joe Rantz is known for being one of the rowers in the University of Washington's eight-oar crew that won a gold medal at the 1936 Berlin Olympics, an event famously chronicled in the book The Boys in the Boat by Daniel James Brown.
The story not only covers the 1936 Berlin Olympics but also delves into the personal lives of the rowers, including Joe Rantz's struggles and triumphs. His daughter, Judy Willman, has been instrumental in keeping her father's legacy alive and sharing the story of the 1936 U.S. men's Olympic rowing team.