Brynnen is of Welsh origin, meaning 'hills'. It's composed of elements 'bryw' meaning hill and 'en' meaning leader, thus translating to 'leader of the hills'. This name gained popularity in the 20th century but remains relatively rare today.
"Brynnen is not a particularly popular name, with only five children being named Brynnen each year in 1998, 2008, and 2015. This results in a total of fifteen babies given the name Brynnen over these seventeen years."