Clint Barton was the first character to take up the name of Hawkeye. He was originally a supervillain that assisted Black Widow and fought Iron Man before he joined the Avengers.[1]
At one point, the Golden Archer used the codename of Hawkeye.[10]
Marvel 2099
There have been two versions of Hawkeye in Marvel 2099:
Max
During the "Secret Wars" storyline, the Battleworld domain of 2099 had its version of Hawkeye who is a member of the Avengers 2099. This version is Max who is an archer that was spliced with the DNA of hawk giving him the wings and talons of a hawk.[11]
An unidentified 2099 reality's version of Hawkeye fought the Anti-Vigilante Act alongside his fellow vigilantes. Like the Battleworld version, he has the wings of a hawk.[12]
An unidentified 2099 reality's version of Hawkeye was briefly displaced on Earth where he helped the displaced version of Spider-Man 2099 fight the Fist. Unlike the Battleworld version, this version does not appear to be a human/hawk hybrid.[13]
Unnamed assassin
On the unified Marvel 2099 reality of Earth-2099, an unnamed person operated as an assassin named Hawkeye.[14]
During the "Onslaught Reborn" limited series, a pocket dimension created by Franklin Richards had one of its inhabitants being a version of Wolverine who operated as Hawkeye.[15]
References
^DeAngelo, Daniel (July 2013). "The Not-Ready-For-Super-Team Players: A History of the Defenders". Back Issue! (#65). TwoMorrows Publishing: 5.