It isn't Jell-O if it's called something else.
That would seem to be obvious. But in case you're still not clear, follow the severed instructional clip-art had, and MEMORIZE THESE BIG RED LETTERS. Do not be fooled by Jall-O or Jill-E or any other false pretenders.
For starters, they may not have the Jell-O girl. See her on the side of the package? She was drawn by Rose O'Neill, who also gave the world the Kewpie Doll, and she first graced the packages in 1908. And in case no one got the connection: