Okay, since I named my NIMH OC "Guinevere", I thought I'd add a little twist to the name. She's a descendant of the Lady Guinevere of the rats in the old times. In fact, when Gwen was given to Nicodemus, he named her after Lady Guinevere. So the name kind of stuck on her.
Nicodemus (c) Secret of NIMH (c) Don Bluth