English has some androgynous names, but often what you see is initially male names being colonized for women. Robin is one of those, a more and more female name as time goes by.

In the case of this author though it is a pen name (real name Megan Lindholm) and I am sure she chose it deliberately. She started using it at a time when women writing epic fantasy got little traction, and the first trilogy she wrote with it was in the first person from a male protagonist to boot. Her books with the pseudonym did far better than the ones published under her real name.