The origin of interest is somehow related to the word “offspring”

The origins of interest will forever remain obscure, since they preceded the invention of writing.

The terminology for interest in most ancient languages is derived from some word for “offspring,” causing some to speculate that it originates in loans of livestock

This is one of the many passages and charts I find in books and articles on a daily basis. They span many disciplines, including:

I occasionally add a personal note to them.

The whole collection is available here.