Possible Clues:

• Robert Knievel, to most
• ___ Knievel
• First name in daredevils
• Car-jumper's first name
• First name of the 'father of extreme sports'
• Motorbike daredevil
• '___ Knievel To Attempt Huge Leap In Logic' ('The Onion' headline)
• First name in awe-inspiring jumps
• 'Being ___' (2015 documentary featuring many wipeouts)
• Stunt master Knievel