Rye island or little king
Rylynne is a modern American invention, likely created by combining the Gaelic-rooted 'Riley' with the popular feminine suffix 'Lynn'. It may also be interpreted as a variation of Rylan, which stems from Old English words meaning 'rye land'.
Less common today
Rylynne isn't in the latest US Top 1000. It last peaked at #8,892 in 2015.
US births per 5-year period, 1990βpresent (SSA data).