Noble
Adalene is a variant of Adeline, which itself is a diminutive of Adele. It ultimately derives from the Germanic element 'adal', meaning noble. This spelling offers a more phonetic approach to the 'leen' ending while maintaining its vintage charm.
Less common today
Adalene isn't in the latest US Top 1000. It last peaked at #3,431 in 2015.
US births per 5-year period, 1990βpresent (SSA data).