In the code on lines 276 and 280 you can see that both of these are being set. Also, so that you are aware this is a public forum and the details you have entered in your current confirm page should be updated from your PayPal profile. You should request new credentials and not use these ones anymore.
I did some testing and was able to confirm that I can see the first and last name of the buyer on PayPal and in the email that is sent. Does this happen for you every time or is it sporadic?