Definitions of Dennis:

• name:  A male given name (very common: 1 in 240 males; popularity rank in the U.S.: #40)
• name:  A surname (common: 1 in 3225 families; popularity rank in the U.S.: #355)
• name:  A female given name (rare: 1 in 50000 females; popularity rank in the U.S.: #2401)