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If you're going to use the French pronunciation, then you should certainly go for Cecilie, and also prepare for a lifetime of explanations. But it isn't easy making French noises in an English environment! I'd stick to lovely Cecily.

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As for other spellings, there's Cicely or Cicily, but Sis isn't the best short form in the world. Cecily was your first choice for a reason - stay with it.