Enterprise is Great wrote:
On that cover, in that costume, it is Clint Barton who gave up being Hawkeye and took on the name Goliath. This was when Pym could no longer use the growth serum because it was too hard on his body. Shrinking was, according to the text, not as demanding. Meanwhile, Clint could handle it supposedly because he was in much better physical condition than Hank Pym.
I believe that Clint was the first to use the name Goliath. He went back to being Hawkeye after the Kree/Skrull war.