Definitions of child:

• noun:   a young person of either sex

  Example: "She writes books for children"

• noun:   a human offspring (son or daughter) of any age

  Example: "They had three children"

• noun:   an immature childish person

  Example: "He remained a child in practical matters as long as he lived"

• noun:   a member of a clan or tribe

  Example: "The children of Israel"

• name:  A surname (rare: 1 in 33333 families; popularity rank in the U.S.: #4730)