Go By Meaning

(idiomatic) To be called, to use as a name.

Example:   I like to sit and watch the world go by.   The rest of the day went by quickly.
  His full name is Ernest Tinkleton, but he goes by Ernie.
To follow; to assume as true for the purposes of making a decision, taking an action, etc.
  I'm only going by what my teacher said.
  a good rule to go by