Definitions of Colby:

• name:  A male given name (rare: 1 in 11111 males; popularity rank in the U.S.: #703)
• name:  A surname (common: 1 in 20000 families; popularity rank in the U.S.: #2642)
• name:  A female given name (rare: 1 in 100000 females; popularity rank in the U.S.: #4081)