Hill and lake
A modern American invention combining the Welsh element 'Bryn', meaning hill, with the popular suffix 'lynn', derived from the Welsh 'llyn' meaning lake. It follows the trend of creating rhythmic, nature-inspired compound names.
Less common today
Brynlynn isn't in the latest US Top 1000. It last peaked at #7,073 in 2018.
US births per 5-year period, 1990βpresent (SSA data).