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I think they're both soft and smooth names. Serena is obviously serene whereas Selena (less obviously) has the goddess of the Moon. Cleopatra's daughter was named Selene.

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I don't know why I said smooth, I just think they are very soft names. I think they would make interesting MNs. As in, they're well known but not expected in the middle spot.

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Just try it maybe with some names you like and see what happens:
Laura Selena
Helen Serena (see, tough Helen with soft Serena)
Caroline Serena
Verity Selena

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