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I'm not a big fan of either, but they're fine. I prefer Sally because Kelly is quite overdone at this point, not to mention that Kelly is also a surname. Fun fact: I've only met people who have Kelly as their SURNAME.

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I do think that Sally is more of a nickname for Sarah than a standalone name though. As far as middles go, I think both are quite versatile. I personally prefer one syllable middles with a 2 syllable first name.