Ticket->Requestor is email address, are there other Ticket-> values?

I am trying to make all of the auto-reply templates have the userid in the
subject line as well, but Ticket->Requestor is long, it is the entire email
address. We would prefer to have just the requestor name if possible.

I have not seen anything which points me to this in the source, but I was
wondering if I was simply missing it.