Adeline's has a lovely, old-fashioned "Sweet Adeline" charm, but has become so popular in the US under so many spellings and variations -- with Adalynn and Adalyn the most popular -- that considered together it is in the girls' Top 10. And group also-popular Adelaide and Addison in there, and you have tens of thousands of baby girls called Addie.
Adeline was introduced to England by the Normans in the eleventh century, was very common during the Middle Ages, then vanished until the Victorian Gothic revival.
The song "Sweet Adeline" as an old barbershop quartet favorite. JFK's grandfather John F. Fitzgerald, mayor of Boston, made it his theme song, and Mickey Mouse serenaded Minnie with it in a 1929 cartoon.
Pronounced ad-a-line in America, it's usually ad-a-LEEN in France.