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Because Amy is so popular for people my age (second only to Jennifer), I think of it as common. However, I think it is one of those deceptively unique names that seem common because there are a lot of adult bearers, but when you look at the name stats for newborns in the past few years, you note Amy doesn't rank that high.

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Here are some other even more deceptively unique names:
Jane
Susan
Joan - almost out of the top 1000 now

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To answer your spelling question, I would use Amy. I am not one for variant spellings. They make life difficult.