Hailee Steinfeld gave her daughter a name on June 19. In a letter to the baby girl on her Beau Society Substack, Steinfeld revealed that she and Josh Allen named their child Harper Haize Allen, ending months of speculation after the couple confirmed the birth in April.
The name lands with the force of a family milestone, not a celebrity rollout. Steinfeld wrote, “Dearest Harper, I’m in awe of you,” and said the infant has already taught her more than she could ever teach back. That line does most of the work here: it shows a mother still trying to guide her child while admitting the child has already changed her. For readers searching now, this is the first clear public answer to the question of what the couple called their daughter.
Steinfeld and Allen had already let in a little light before this reveal. On May 12, they shared the first photos of the baby for Mother’s Day, including one image of Harper’s tiny fist wrapped around Steinfeld’s finger. A separate photo showed the infant’s feet in a black and white spotted onesie with red feet, and Steinfeld wrote that she was “simply obsessed with this.” The family update has been unfolding in pieces, with Steinfeld teasing the nickname Baby Beau in a Jan. 2 newsletter post before the birth was confirmed.
The middle name, Haize, is the one detail Steinfeld did not explain, and that absence matters because the letter is otherwise so intimate and exact. She said she wants Harper’s baby hair to stay soft forever, yet also looks ahead to the day the child might ask her to braid it “down your back while we’re sitting in the grass.” That is the pull running through the piece: a parent trying to look after a child who has already become the subject of wonder. It is also why the full name feels less like a public announcement than a private sentence made visible.
There is one more reason the name reveal lands now. The couple married in May 2025, and Allen had already signaled in April that fatherhood had changed his mindset and would help bring out “the best version” of himself. Steinfeld had said much the same thing before the baby arrived, telling Bustle she was “of course” looking forward to starting a family and that the timing had to be right. The next public step from the family is not spelled out, but after the name, the photos and the letter, the story has moved from confirmation to identity: Harper Haize Allen is no longer a placeholder in a birth announcement. She is the child Steinfeld is already talking to as if she can hear her.
