I've gotten responses from various people on a couple of different forums. I'm posting this summary in three places at once, to bring any interested observers up to speed.
Here's how it now stands:
Ancient One (on comicboards.com) assures me that in his first appearance (in "Action Comics #45"), the kid was
only referred to as "Stuff." Apparently that was the nickname which he was already using all the time before he ever met Greg Sanders.
73042helloworld and
narfstar (on comicbookplus.com) assure me that between the two of them, they've managed to check Stuff's first 16 appearances in "Action Comics," and they have not yet found him being called anything other than "Stuff," "the Chinatown Kid," and "Stuff the Chinatown Kid."
So here's my
current theory: All through the Golden Age Vigilante's run, his Chinese-American sidekick was
always called "Stuff."
Decades later, someone felt it necessary to retcon in a "real name" for the kid, and used either "Jimmy Leong" or "Danny Leong."
Years later, someone else was dealing with the character, and probably tried to "wing it from memory" regarding what his real name was, and got it wrong,
accidentally giving him a new first name. Hence the contradictions I found in various online resources. (Similar to what I've heard about how The Elongated Man's surname has been rendered, in various stories, as Dibny, Dibney, Digby, and probably other variations, when one writer or another thought he could remember it perfectly without looking it up!)
Incidentally, here's something I didn't mention a few days ago when I launched the thread, although I had already learned it from my research:
Greg Sanders, The Vigilante, was featured in a 15-part movie serial in 1947. (He was played by Ralph Byrd, whom I've seen in some old Dick Tracy movies from that era.) In the movie, he had a sidekick called "Stuff." I looked up the details online because I thought the movie credits might include some mention of what Stuff's real name was in those days.
Nope. It turns out that this attempt on my part failed for the following reasons:
1. I gather no other name was mentioned in the movie; just "Stuff."
2. The "Stuff" in question was
not Chinese-American; he was just a white boy who looked several years older than the kid in the comics; old enough to be drafted. (He was played by an actor named "George Offerman Jr.", whose name rings no bells in my memory.)
So even if the name on his birth certificate had been mentioned in the film, it probably would have been something Anglo-Saxon sounding, instead of faithfully adapting anything that had been mentioned in the comic books.
And as it now stands, it probably wouldn't have mattered anyway, since my current impression is that in the old days Stuff
didn't have any name other than "Stuff," so the movie probably would have just stuck with that even if they had him played by a Chinese-American actor!
P.S.
Ancient One was also kind enough to offer a scanned image of one page from the story in which Stuff first made his appearance. The kid ends a speech on that page with the words "or my name ain't Stuff!" This could be taken as evidence that "Stuff" was, in fact, part of the real name listed on his birth certificate . . . but I doubt it.
On the other hand, I was quite amused by a bit on that page where Greg Sanders, as his unmasked self, is assuring Stuff that there's a serious chance he can get "The Vigilante" to drop in for a chat about some terrible problem confronting Stuff's grandfather, later that night, and a redheaded woman overhears this and thinks critically: "The big phoney! Giving the poor child false hopes!"
I can see the concerned lady's point, I suppose. The Vigilante was a superhero who wore a bright blue shirt, light blue trousers (denim jeans, I'm guessing), brown leather cowboy boots, a brown Stetson, crossed gunbelts, and a bright red bandanna
pulled up to cover most of his face. On the other hand, this country-western musician called "Greg Sanders" was a civilian of similar height and build who wore a bright blue shirt, light blue trousers (denim jeans, I'm guessing), brown leather cowboy boots, a brown Stetson, crossed gunbelts, and a bright red bandanna
loose around his neck. Obviously the two men had
nothing in common and couldn't possibly be on close terms!
I wonder how long it took
Stuff to catch on? Or did Greg finally have to spell it out for him?