What was the name of Ananias's wife, who died after lying about the price of their land?

Answer: Sapphira

Ananias and his wife Sapphira kept back part of the money from a property sale and lied about it; both fell dead.

“Now a man named Ananias, together with his wife Sapphira, also sold a piece of property.”— Acts 5:1 (BSB)