Wise counselor or ruler of the lake
Reylin is a modern American invention, likely created by blending the Spanish or French 'Rey' (meaning king) with the popular suffix '-lin'. Alternatively, it may be a variation of the German name Raylen, combining elements meaning 'wise counselor' and 'lake'.
Less common today
Reylin isn't in the latest US Top 1000. It last peaked at #8,585 in 2018.
US births per 5-year period, 1990βpresent (SSA data).