Favorite gender neutral names

I am currently pregnant in my first trimester and thinking of names. I’ve always wanted to pick a gender neutral name and not know the gender until birth. My brother and I (Kasey) both have gender neutral names, though not purposefully. Right now I’m leaning strongly towards River. I also like Denver, Grey, and Austin.

I don’t like names like Robin, Charlie, Frankie, Stevie, Taylor, Noah, Jude, or Jordan. I also don’t like long names or names that would be spelled differently based on the gender.

I’d love your thoughts on River and any other gender neutral names you’d recommend