may have just learned real last name, but he's the reason she learned to embrace another moniker. During a recent press junket interview to promote her new movie, , Lively's costar Isabela Ferrer—who plays a younger version of Lively's Lily Bloom in the film—had a hard time guessing the actor's middle name. “I don't talk about it much,” Lively admitted.

“I know your proper last name is Brown and your mom's last name is Lively," Ferrer said while wracking her brain for the correct answer, which Lively eventually revealed is “Ellender.” “It’s not a name. My mom, I think, made it up by accident," Lively said throughout the interview.

"It’s not a word, it doesn’t exist.” Before you ask, it's pronounced Ellen- , not Ellen- . “I'm not Dumbledore, it's Ellender,” the 36-year-old confirmed, joking that the famous wizard's name is “probably a better option.

” "I always like was really confused by it, so I always hated it," Lively said of her middle name before explaining how Reynolds changed her mind. "But my husband loved it, which made me like it more. And he's like, 'It sounds like lavender.

' And I was like, 'Ooh.'" Reynolds previously joked that he "just found out" his wife's last name when she announced her new haircare line, , on July 31. "I'm obscenely proud of this woman," the star also wrote in an Instagram Story, per .

"The result is exactly what you'd expect of a hyper-obsessive, detail addicted, uncompromisingly quality control genius." Blake.