I like
River. It's one of the very few names I don't have a preferred gender for, actually. I think it works equally well on girls and boys.
Cosmia is all right, but for some reason it makes me think of noses! I like
Cosima better.
Emily is great. I really like it, too. I think I started liking it when I found out my great-grandmother was named
Emily, lol. But it's just such a sweet, happy name that I can't help but love it anyway. I do wish it was less popular, because I love it. I could see myself using it as a middle name though.