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They're both lovely names. Lydia is, like you said, the more likely to stay on the fringes of being familiar but not overused, as it's a classic/Biblical name. I think you're right that Hazel, on the other hand, could have a huge resurgence then fall quickly out of popularity (and I suppose that does mean it could be seen later as dated - it's funny to anticipate datedness :) ). I think especially because of The Fault in Our Stars book/movie it'll blow up, then maybe have backlash. But I like it!