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I think it depends on how much people know about names. Nicknames like Polly were used back when fewer names were used and there were so many women named Mary that it got confusing. That practice isn't common anymore because there's a much bigger "name pool."

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However, I don't think that should stop anyone from using them. The average person might not know that Polly comes from Mary, but it's easy to explain that it's an old nickname and it's not as if Polly itself is unfamiliar. All the nicknames you mentioned are also used as full names, but I think it's still perfectly acceptable to use them traditionally.

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