Eva is Latin for Eve. In the Bible, Eve the first woman. She ate the forbidden apple and in doing so cursed mankind for eternity. In this biblical tale, Eve is betrayed and plagued by ill-fortune.
Eva is similar, as she is betrayed by mankind. She is forced to suffer a destitute life filled with sadness and suffering because of her lowly position in society.
Eva is banished for showing independence and a lack of deference (like Eve) Eve is a symbol of Man’s downfall. Eva brings about the downfall of the Birlings.