Definitions of jolly:

• noun:   a happy party
• noun:   a yawl used by a ship's sailors for general work
• verb:   be silly or tease one another
• adjective:   full of or showing high-spirited merriment

  Example: "The jolly crowd at the reunion"

• adverb:   used as an intensifier (`jolly' is used informally in Britain)

  Example: "Jolly decent of him"

• name:  A surname (common: 1 in 14285 families; popularity rank in the U.S.: #1819)