Answer
Ava's full middle name was Lavinia. It is mentioned in the novel that she was named after her great-grandmother, who was also named Ava Lavinia. The name Ava is a Hebrew name that means "life", and the name Lavinia is a Latin name that means "from Lavin", a town in Italy. Ava was a very popular name in the Victorian era, and it is still a popular name today.