Noble
Adyline is a modern variation of Adeline, which is a French diminutive of Adele. It ultimately derives from the Germanic element 'adal', meaning noble. While rare, it follows the trend of using the 'y' spelling to give a classic name a contemporary feel.
Less common today
Adyline isn't in the latest US Top 1000. It last peaked at #6,389 in 2016.
US births per 5-year period, 1990βpresent (SSA data).