I quite like this name, I think more than Nyx. Also, people need to stop saying that every feminine name that doesn't fit their small-minded idea of femininity isn't a female name.
I think Nox is great. Simple, modern, but grounded in classic mythology, and a viable name for any gender (all this makes it a very popular choice with gender-nonconforming folks as well as new parents). Short but sounds good, slightly but not overly edgy, and its association with the god of night I think at least makes it a very cool name, for a very cool person.