Brynnlee is a modern American blend of Brynn, from the Welsh word bryn meaning "hill", and the fashionable ending -lee. It belongs to the same family as Brynlee, Brinley and Kinslee, which spread through the Mountain West and the South in the 2010s. Brynnlee rose from number 2093 in 2015 to a peak of number 1358 in 2021 and ranks number 1694 in 2025.