This variation of Adele sounds somewhat more feminine than the original by virtue of the a- ending. It could join the army of popular A girls' names, especially with its tie to the recent celebrity-related success of Adele. Adela, which came to England with the Normans in the eleventh century, has a royal pedigree via William the Conquerer's youngest daughter.
Adela Quested is a character in E. M. Foster's novel "A Passage to India," and the name also appears in an Agatha Christie story. Jouralist/novelist/screenwriter Adela Rogers St.Johns was a colorful character in Golden Age Hollywood.