Elissa Cassidy is the main protagonist in the 2012 American psychological thriller film House at the End of the Street. Her character is portrayed by Jennifer Lawrence.
"Elissa" is the name of a song by The Cruxshadows, on their Dreamcypher album. The name's description mentions that Elissa was Dido's other name, and there is also a song called "Dido's Reply" on the same album.
Elissa Landi (born Elisabeth Marie Christine Kühnelt) was an Italian-born actress who appeared in Hollywood films in the 1920s and '30s (e.g., The Sign of the Cross, After the Thin Man).
A million times prettier than Dido in my opinion, and very rare. In fact, the only time I've heard it used was in "The Phantom of the Opera", when it's the name of the lead female role of the opera-within-the-musical "Hannibal". It's Elissa (played by Christine) who sings "Think of Me" at the begining of the show.