The ancient Germanic tribes (from about 2,000 years ago) did as well. They would chop a club out of wood with an axe. But it didn't have the usual rounded sides like a modern billy club or baseball bat. Instead they cut the wood so that it made a V shape, with the narrow part the business end. They would hold it with their hand behind their had, the club trailing out behind them. Then they would whip their arm down in a top to bottom strike. Because of that V shape, all the kinetic energy of the blow was concentrated in a very small area. It was more than enough to crush a human skull in one strike.

Here it is

There is a Kanabo mod for Fallout 4. I got it to use with power armor. It looks like it might be big enough that it would look tiny in an armored fist.

I saw a really cool 'sword' with an edge made of shark teeth, on display in the National Museum of Scotland in Edinburgh. The logic of the weapon is pretty solid.

Another weapon that piqued my interest recently would be the trench knife. It offers all the uses a knife could have with the addition of brass knuckles. Very simple in its form and function. That's why I like it. That's why I like it a lot.

Sounds a bit like a macuahuitl!