Actress Hailee Steinfeld and Buffalo Bills quarterback Josh Allen reveal the name of their baby daughter in a public announcement made about two months after her birth. The couple share the full name, Harper Haize Allen, through a heartfelt letter published on Steinfeld’s Substack newsletter, Beau Society, dated June 19. In the letter, Steinfeld writes directly to their daughter and reflects on the early stage of motherhood, describing day-to-day life as centered on routines such as naps and time measured in smaller increments. Multiple outlets report that Steinfeld and Allen welcomed their daughter on April 2, with their Santa Barbara wedding in May 2025 occurring less than a year earlier. The announcement also adds context on how the name connects to Steinfeld’s past, according to reporting that links the meaning of the name to a personal milestone from her career. The couple’s earlier period of privacy and suspense ends with the release of the daughter’s full name.