Brynn is the feminine spelling of the Welsh Bryn, meaning "hill", a word found all over Wales as a place-name element. It appeals as a short, modern-sounding name that pairs well with longer middle names, and Brynlee and Brynleigh grew out of it. Brynn peaked in the United States at number 189 in 2012 and has slid gently to number 407 in 2025.