Definitions of derrick:

• noun:   a simple crane having lifting tackle slung from a boom
• noun:   a framework erected over an oil well to allow drill tubes to be raised and lowered
• name:  A male given name (common: 1 in 970 males; popularity rank in the U.S.: #178)
• name:  A surname (rare: 1 in 25000 families; popularity rank in the U.S.: #3330)