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I'd use Kira, to eliminate all confusion as to how to pronounce it. Kira's my niece's name.
Ciara sometimes is intended as a different spelling of Sierra, and I've even known it to be pronounced See-AHR-a. It's just needlessly ambiguous.

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Before you criticize a man, walk a mile in his shoes. That way, when you criticize him, you're a mile away and you have his shoes!
Steve Martin