- Wombat: In an interview with NBC's Matt Lauer in 2007, William revealed that "wombat" was Princess Diana's nickname for him when he was a kid. "It kind of stuck with me. I can't get rid of it now," William said. "It began when I was 2. I've been rightfully told because I can't remember back that far. But we went to Australia with our parents, and the wombat, you know, that's the local animal . . . So I just basically got called that. Not because I look like a wombat — or maybe I do."
- Steve: While attending the University of St. Andrews in Scotland, William reportedly used the fake name to maintain a low profile.
- Babe: During a visit to the Chelsea Flower Show in 2016, Kate Middleton referred to her husband as "babe" as they checked out flower arrangements.