Yes, that's one of the hard decisions. I reason that
Adeline has been "stuck" with the "line" pronunciation because of the fame of the song "Sweek
Adeline", and that was recently reinforced by the 2015 movie "The
Age of
Adaline", where the "line" pronunciation was used. So I reasoned there probably aren't many Adelines or Adalines who use the "lynn" pronunciation.