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Raymonde is pronounced [reh-MOND], so the "Ray" nickname isn't intuitive and I guess most people would butcher the name as "Raymond" anyway.

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For 'Ray' I'd go with something like Rachel, Rain, Reina, or the Japanese Rei (or Reika / Reiko) (pronounced the same).

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More ideas (even if some are a stretch):
Mireia / Mireille
Lorraine
Igraine
Andreia [un-DRAY-a]