Justin Howard Yes, named Rwyan. Daviot meets her in... I forget the name of the city... while they are both studying in the colleges of Mnemonikos and Mages, respectively.
Rachel Lein I believe so, yes. I have been trying to track this book down for a long, long time, with the same recollection, and I'm pretty sure this is the one. Her name starts with an "R", if I remember correctly.