Definitions of hefty:

• adjective:   of considerable weight and size

  Example: "A hefty dictionary"

• adjective:   (of a person) possessing physical strength and weight; rugged and powerful

  Example: "A hefty athlete"

• adjective:   large in amount or extent or degree

  Example: "Received a hefty bonus"

• name:  A surname (very rare: popularity rank in the U.S.: #31861)