Definitions of William:

• name:  A male given name (very common: 1 in 40 males; popularity rank in the U.S.: #5)
• name:  A surname (common: 1 in 6250 families; popularity rank in the U.S.: #731)
• name:  A female given name (rare: 1 in 14285 females; popularity rank in the U.S.: #1118)