Noble one
Adalynne is a modern American elaboration of Adeline or Adela. It combines the Germanic root 'adal', meaning noble, with the popular 'lyn' suffix and a French-inspired 'ne' ending. While it sounds vintage, this specific spelling is a contemporary creation.
Less common today
Adalynne isn't in the latest US Top 1000. It last peaked at #1,882 in 2015.
US births per 5-year period, 1990βpresent (SSA data).