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I love Nessa. Am not familiar with it as a name on its own, but as NN for Agnes (and Vanessa I guess, but I don't really care for that name).
Nava doesn't sound nice to me ( maybe too close to naval / navel?) but I'm not sure how you pronounce it.
Ariel is nms, but it is what you have picked, so I would say I think Ariel Nessa is the best.