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Pollyanna Cook sounds fab, with Polly for short - it sounds like the sort of name I would have longed for as a young girl!
The advantage to your surname is you can have names ending in -y, eg Emily, Lucy. If we had had a dd I so wanted Esme, but our surname is Scottish, ends -ie, pronounced -ee so any first name ending in y sounds too uppy-downy iykwim.