Island meadow or rye clearing
Rilyn is a modern American invention, likely created by blending the traditional surname-name Riley with the popular 'lyn' suffix. While it lacks a singular ancient root, it inherits the Old English meaning of 'rye clearing' from Riley and the Welsh or English associations of 'lake' or 'pool' from the 'lyn' element.
Less common today
Rilyn isn't in the latest US Top 1000. It last peaked at #1,971 in 2012.
US births per 5-year period, 1990βpresent (SSA data).