What is the reason for the name of the Flyweight Design Pattern?

I'm a non native English speaker, and trying to grasp a better understanding of that design pattern, I'm interested in the origin of that word for naming a pattern. What are the motivations for that name?

As far I know the flyweight design pattern is concerned with a way to support large number of fine-grained objects using sharing.

However, the definitions I'd found for that specific word (flyweight) refers to the boxing category of weight of less than 112 pounds.

So, why the pattern is called in this way?

Sorry if this seems foolish, but I really have no clue.