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It's pretty contrived, really. When Bird is used as a nn, it's more often not related to the name at all, but to some quality of that particular person, like having long gangly bird legs or an otherwise birdlike look. Not necessarily unkindly meant, but also not especially flattering either.
I've known a few Robertas but none of them went by Birdie; most were Bobbie.

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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