It's a fan name.
In the microman line there was a robot that Hasbro didn't buy the rights to. However, Takara packaged it on Bumblebee cards as well as CLiffjumper cards.
Also, the South American companies were able to produce the character under the name "Sedan".
So since there is no original name for the character that was packaged with BB and CJ, it was given the fan name, "BumbleJumper", and some dude in Australia called it "CliffBee", and that one is used also.
In S. America, he's just "Sedan".
He's in my sig, 2nd row from Right, first back, Yellow with Black bumper.
That's why when I refer to him I say, Sedan/Bumblejumper/Cliffbee.