Definitions of Roberts:

noun: a Welsh pirate credited with having taken more than 400 ships (1682-1722)
noun: United States writer remembered for his historical novels about colonial America (1885-1957)
noun: United States evangelist (born 1918)
noun: United States biochemist (born in England) honored for his discovery that some genes contain introns (born in 1943)
name: A surname (very common: 1 in 653 families; popularity rank in the U.S.: #43)