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I think she is only known by the title Mrs. Bennet. I cam' recall an actual name.
Her first name is never given, she is referred throughout the book only as Mrs Bennet. However, her maiden name is known - it is Gardiner. We know this because Elizabeth's and Jane's aunt and uncle with whom they stay in London are Mr and Mrs Gardiner, and the gentleman is Mrs Bennet's brother. So before she married, she would have been Miss Gardiner.