The original Gorilla Man is Kenneth Hale:
|Gorilla Man (Kenneth Hale) - discovered and killed legendary Kenyan Gorilla-Man, resulting in his transformation into the Gorilla Man, former member of S.H.I.E.L.D.'s Howling Commandos, member of Agents of Atlas|
There are multiple individuals who have used this name in the Marvel Universe.
Gorilla-Man (Franz Radzik) - created an electro-magnetic ray machine to transfer his mind into a gorilla's body, sent to deep space