Hawkeyes full name is Clint Barton.Orphaned at an early age, Clint Barton and his brother Barney escaped an oppressive orphanage and ran away to join the circus—the Carson Carnival of Traveling Wonders. The youth fell under the sway of the Swordsman, a charismatic fellow performer who teamed up with the talented Trick Shot and trained his young charge to be an expert with a bow and arrow. When Barton found his mentor embezzling funds from the show, he attempted to alert the authorities. But, instead, he suffered a beating from his roguish role model, bringing the apprenticeship to a violent end.
After awhile of being on his own he found himself in a rare encounter where he saved the life Edwin Jarvis. This got him a way into the Avengers.