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As Chrisell said, Aya is the safest spelling--and it's a legitimate spelling, too. Use that one.

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Aiya also comes to mind, but that looks like a "HIIIII-YAAAA!" karate chop noise. :)

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Array

I'd just use Aya. I *wouldn't* use Ayah, as it's a word meaning "an Indian nursemaid who looks after children".