When you sign up for Spotify, many users want the ability to change Spotify usernames. While you can connect your Facebook account to your profile, Spotify has made it very clear that you can't change your username on Spotify due to the way the Spotify system maps playlists to different accounts. If you do connect your account to Facebook, your friends will see your real name instead of your account name.
How To Change Spotify Username on Facebook
1. Click on the down arrow next to your profile name on the top right of Spotify.
2. Scroll down to Social and click the blue button ‘Connect To Facebook.'
3. Authorize Facebook to connect to Facebook.
4. Voila, you have now changed your Spotify display name.