How about the Jeep Incontinent?
After the war in 1945, Willy’s wanted to produce the Willys MB for civilians. However, the nine-slot grille was Ford’s design, so Willy’s couldn’t trademark it. So Willys subtracted two of the nine slots to make it a seven-slot grille and this was enough of a change to get a trademark. By the end of the year, Willys had produced the Willys CJ (Civilian Jeep) and this became the face of the Jeep brand.