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I think it's much safer as a mn. Yes, it does have Latin gravitas and this is a good thing, but (a) the meaning is a bit ambitious, especially for the kind of baby that cries all night, and they all do sometimes. (b) is worse: it shortens to Perp as in the person who commits a crime, the perpetrator.

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Luckily, all your suggested names would work well as fns with Perpetua as the mn.