Different forms with different Subjects and variables

I have two forms on my site, but will probably add another one. How can I do the following:

  1. Assign a unique subject to each form
  2. In the subject, I would like to include a variable. Maybe the FirstName or email of who is submitting

I use Gmail for organizing my mail, but if all the forms arrive with the same subject, Gmail groups them and maks it hard to manage. Also, having the name or other variable info in the email, make it easy to identify and manage.

Mest regards