My Phone Contacts Who Are Unknown to Me

Who even are these people? And how did I get their numbers?
  1. Always Call This Cab
  2. Ger Ger
  3. Happy Hopper
  4. Jimmy Johns (Well, we all know who that is. But why?)
  5. Keith Mover
  6. Nite Rider
  7. Plaza de Armas
  8. Rejection Hotline (OMG I know what that is, and everyone must call.)
  9. Sam Greeneggsandham
  10. Y R U Up?