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Blue, if you're counting River, I'd say any name evoking blue or water counts, Brooke, Rain, Lake, Ocean, Oceane, and Azure, Sapphire, Sapphira, and I'd count Sky/Skyler.

https://www.behindthename.com/names/meaning/blue,sapphire

Blue (obviously), Azure, Azura, Sapphire (maybe?), Cerulean (doesn't really sound like a name to me but I once met a guy named Cerulean), and... That's all I can think of off the top of my head.