Is Naida a good name for a sea nymph?
I think Marissa and Caspian are very good. Maia is good. Cordelia is fine. I like the name Naida, but it too obviously comes from Naiad. What I do when I have to name sea-y women sometimes is to go to http://www.paleothea.com/Nymphs.html and scroll down to the “Nymphs by Name” and pick one I haven’t heard of, and maybe corrupt the spelling to make pronunciation easier.