Is there a way to auto-identify the execution variables needed for a Test Suite?

We are creating scripts which have execution variables within them.  We are then assigning the specific values via the Test Suite. 

Currently, we have to go through each test script linked to the test suite to identify the needed variables and then manually add them to the test suite.

Is there any way to have the variables within the linked scripts identified within the the test suite so that we don't run the risk of missing any?

Additionally, if I'm using the same test case within a test suite, is there a way to include different values for the same variable?  For instance, if I'm registering multiple people for a program, I would want unique values in the First Name variable.