Enid is the only one of the three I actually like. It has a quirky / nerdy charm to it. And I've said it before, but it also makes me think of insects / entomology.
Edith... I can tolerate, because the nickname Edie isn't too bad. But there really are few names I like that end in -th, and Edith really isn't one of them. (I prefer Eden, but I'm not a huge fan of Eden either.)
Can't stand Edna, though. Sorry.
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