Lake meadow or flax meadow
Lynlie is a modern American coinage, likely created by blending the prefix 'Lyn' (derived from the Welsh word for lake) with the suffix 'lie' (derived from the Old English word for meadow). It may also be interpreted as a variant of Linley, which refers to a meadow where flax was grown.
Less common today
Lynlie isn't in the latest US Top 1000. It last peaked at #12,439 in 2017.
US births per 5-year period, 1990βpresent (SSA data).