Derek

Characters:
 * Derek - ..... in Fallout.
 * Derek - the "grandmaster cook" of the Den in Fallout 2
 * Derek Greenway - the Van Buren scientist
 * Derek Pacion - a child in Canterbury Commons in Fallout 3
 * Derek Remmings - an employee of the Museum of Technology in Fallout 3

Real-life people:
 * Derek Gibbs - a Technical Resource Specialist who worked on Brotherhood of Steel
 * Derek Hand - an artist who created some art for the canceled Fallout Pen and Paper d20
 * Derek Johnson - Tester who worked on Fallout 2