5. Mazda Wankel Rotary
We know. This engine was named after its inventor, Felix Wankel. And being a German, maybe he was unaware of how close his last name was to the British put-down term ‘Wanker’. Either way, those with a grasp of the English language have a hard time not thinking of Wanker when they hear Wankel. Let this be a lessen to you Mr. Poopstaim.