Selena Gomez's nickname is usually Sel. Her best friends such as Demi Lovato, Miley Cyrus, Jenniffer Stone, etc. call her Sel. Please DO NOT edit this. It is an official answer from DisneyOfficials!
Sel and Selly
Her nick names are Sel or Selly.
Nick Jonas..
Gianna
Marie
@selenagomez
THE SCENE
Selena Marie Gomez
Monte Carlo
uhm .. Selena Gomez .?
Her characters name is Faith.
Amanda Cornet
Her full name is Carter Mason.