Definition of "Eva"

"Eve," said Poirot thoughtfully. "The fashions in names change, do they not? Hardly ever, nowadays, do you hear of an Eva. But Eve, it is popular."

1951, Agatha Christie, Mrs. McGinty's Dead, Bantam Books, published 1988, page 150

Mrs Saunders referred to Aoife throughout this talk as 'Eva' and when Gretta corrected her, Mrs Saunders replied that didn't Gretta think it would be better 'for everyone' to use what she termed 'the proper spelling' of the name? If only to give Eva a better chance of learning to write it?

2013, Maggie O'Farrell, Instructions for a Heatwave, Tinder Press, page 79