The original Hawkeye is Clint Barton:
|Hawkeye (Clint Barton) - long-standing member of the Avengers, former leader of their West Coast branch, killed by Scarlet Witch, resurected after M-Day, now known as Ronin|
There are multiple individuals who have used this name in the Marvel Universe.
Hawkeye (WWII) - Lieutenant in World War II, killed in action
Hawkeye (lester) - Lester become Hawkeye when he joined the Dark Avengers.
There are multiple individuals who have acted as imposters using this name.
There are multiple individuals who have used this name in alternate realities.