You're free to use names on this site to name anything in any of your own works, assuming they aren't already trademarked by others of course.
All background images part of the generators are part of the public domain and thus free to be used by anybody,
with the exception of user submitted backgrounds, game images and the pet name generator images.
All other original content is part of and cannot be copied, sold or redistributed without permission.
I don't necessarily think women are sidelined as such – there are just a large number of factors that can affect how prominent female artists seem to be in the fantasy/sci-fi industry and community.