Well Mustadio is also the name of a Final Fantasy Tactics character if that helps.
Yes, even the KOF '96 Collection database disc simply refers to him as “Goenitz” and that disc mentions the full names for every character at the time (including Ralf Jones and Clark Still, whose full names are never mentioned in the game itself).
Speaking of which, has the spelling “Steel” for Clark’s surname ever been used officially? Its always been “Clark Still” and never “Clark Steel”. I get the impression that fans misromanized Still as Steel and are accusing SNK of changing “Steel” to “Still” when SNK never used “Steel” in the first place. The way Clark’s surname is rendered in Japanese (???) is exactly how “Still” would be rendered in Japanese, as opposed to Steel (which would be ???, with an elongated “i”).