What Did Our Ancestors Do?

So here was our conversation at dinner:

Ethan: I've realized that a lot of times peoples' last names have something to do with what their families did. Like the Schumacher's family probably used to make shoes. And the Hausmans . . . I think they made houses. Or maybe they sold real estate.

We all giggle.

I ask, "In Germany?

Ethan, with a grin: Yeah, they were ancient German real estate agents. And the Olivers sold olives, obviously. But what about Butz?

We're all silent. Then we burst out laughing.