Modern invented name, possibly meaning light or lake
Nailyn is a modern American coinage with no singular established etymology. It likely combines the popular 'lyn' suffix with the Arabic name Nayla, meaning 'attainer', or is a variation of the Irish name Nayla, meaning 'champion'.
Less common today
Nailyn isn't in the latest US Top 1000. It last peaked at #11,439 in 2016.
US births per 5-year period, 1990βpresent (SSA data).