Purposeful Mis-Naming of Main Character

In both Jane Eyre and The Flight of Gemma Hardy characters repeatedly call the main characters by a wrong name. But while in Jane Eyre it seems to be a mis-name, or a pet name, In The Flight of Gemma Hardy it is very purposeful. Gemma changes her name to Jean after leaving Sinclair and begin searching for a job. She not only changes her name, but increases her age on job applications and creates more or less a false identity. From this point on the story and Jane Eyre differ greatly. While Jane is called Janet repeatedly by different characters, Gemma goes for over a half a dozen chapters by Jean, fooling everyone around her, including her fiance. 

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