Definitions of Louis:

• noun:   United States prizefighter who was world heavyweight campion for 12 years (1914-1981)
• name:  A male given name (very common: 1 in 411 males; popularity rank in the U.S.: #75)
• name:  A female given name (rare: 1 in 20000 females; popularity rank in the U.S.: #1331)
• name:  A surname (common: 1 in 12500 families; popularity rank in the U.S.: #1629)