Eowyn and other Tolkien names
Eowyn is the girl version of Samwise for me. She did so much there at the end, but she doesn't get a ton of recognition. Unlike Arwen, her name isn't used nearly as much but I find it beautiful and so much more lyrical than Arwen.
Here's some other favorites I think are usable:
Arwen -- obviously
Galadriel -- I know it's super connected, but it's beautiful with a lovely meaning
Lorien -- which is a place and I am using
GP from the list -- Goldworthy. It has lovely connotations and would be a spectacular middle.