Definitions of Halley:

• noun:   English astronomer who used Newton's laws of motion to predict the period of a comet (1656-1742)
• name:  A female given name (rare: 1 in 100000 females; popularity rank in the U.S.: #3646)
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #7330)