A second name for Riyuna?

I'm struggling to decide on a second name for Riyuna. I don't want anything generic or common. The original second name was June, but this doesn't work anymore as I've since changed her surname to Lejeune.

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I still want her second name to have a whimsical vibe, but I can't think of what it should be. The character lives in France and she is French so I'm looking for names that work in French, but are of Japanese origin.

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Thanks.