More info about the name "Willa"
The name is a feminine version of the male name William, which originates from the German name Wilhelm. It means one who is a resolute protector. Actress Kerry Russell’s daughter is named Willa and it is also the middle name of actress Meryl Streep’s daughter.Willa originates in Germanic languages and means "will to protect". It is most likely a feminine form of William although some sources suggest it might be a diminutive of Wilhelmina. Willa is the name of Stephen King's 2006 short story. As a feminine given name, it was popularized by the American author Willa Cather, the Pulitzer prize winner.