I’ve always thought it was pretty masculine. It would definitely work!
it’s fine on a boy. still mainly masculine, isn’t it?
I think it’s unisex. I could see it work on either a boy or a girl, though I personally prefer it for boys.
I like [name_u]Riley[/name_u] for a boy much better than for a girl. There is a boy [name_u]Riley[/name_u] in my family. I’d say you can definitely use it!