Is there one person or creator cited as the inventor of cyberpunk?
The term "cyberpunk" is almost universally associated with William Gibson and, to a lesser extent, to some other authors; but Gibson didn't create this literary genre, end he even didn't create its name, which was first used by Bruce Bethke as a title for one of his short stories.
Cyberpunk (the genre, not the name) wasn't actually invented by any single person, but emerged from the works of various authors who contributed to its definition and evolution; Gibson was indeed one of its greatest expressions.
More info, as usual, at "Cyperpunk" on wikipedia.
Bruce Bethke coined the word. Well-known editor Gardner Dozois popularized its use in connection with the kind of SF being pioneered in the early 1980s by Gibson, Sterling, etc.
If you mean who invented it, William Gibson invented the term and what it is.
It should be noted that the Vernor Vinge novella True Names (1981) pioneered many of the styles and concepts central to the idea of "cyberpunk" even if that term hadn't been invented yet.
Fully immersive virtual reality, anarchism, and early 1980s punk embellishments... all the elements are there.