Since his gradual rise to stardom, Robert Irwin has become a household name. The son of "Crocodile Hunter" Steve Irwin has probably heard his moniker shouted plenty of times by fans of "Dancing with the Stars" or viewers of his spicy transformation pics in his Bonds underwear ad. Many even remember him as Bob, which Steve called him as a baby — though he seemingly grew out of it after his father's tragic death. But fans might not know that Robert has a secret nickname: Brian.

According to Robert, his older sister, Bindi Irwin, occasionally referred to him as Brian growing up. "She still calls me Brian," the wildlife conservationist told "Good Morning America" in November 2025. "Especially if I've annoyed her a little bit." The nickname comes from an old video — which Robert posted on

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