In German, groß Zahn means big tooth, so it makes sense as the man's name; he's an Eisbiber, and they have the distinctive dental features of beavers. Additionally, the groß part might indicate that the business is prominent.
Also related to the Eisbiber/beaver connection, the Lodge to which some of the characters in the episode belong convenes in a dam. In the show, it's referred to as "the old power plant at the Bull Run Dam." It's also the location where Nick confronts the reapers. In some shots, the hydroelectric generators are visible.
The beaver/dam connection might be a bit obvious - as some of the other Wesen/animal traits on the show are - but I figured I would mention it as long as I was going to write about Grosszahn's name.
