Naming convention for graphs?
The most general way of naming a graph is by writing,

Y vs X graph

An example is, Distance vs Time graph. In which the Y axis represents Distance and X represents time.

In order to know which comes in which axis you have to have a clear understanding about independent and dependant. Thus is easy to understand. Once you have clearly understood the axes you have to make the Y axis the dependant variable and X the independent one.

Then the name of the graph becomes ,

Dependant variable vs Independent variable.

For instance consider the Distance vs Time graph. 
We see that Distance depends on how long has the time passed. Thus D becomes the dependant variable