My name isn't Terissa, but I don't think it has one fixed meaning. It's a coincidence that there are other Terissas out there, as other parents could have been making up what they thought was an original combo of names such as Theresa and Nerissa, Marissa, Clarissa etc. It's such an evident combo that I'd be surprised if no one had it as well as you. I hope that answered your questions.
This message was edited by the author on April 8, 2009 at 3:46 AM