you'll need to create a new selfjoining table for each field to count.
So, if you have now:
you have to create two seljoining tables Table 2:: FirstName and Table 3:: LastName.
Then you can create into Table two new calculated fields:
CountFirstName = Count ( Table 2:: FirstName )
CountLastName = Count ( Table 3:: LastName )
Note that those are unstored calculations, so use them ONLY if you real need.