Who made all the words?

Mette crawled into our bed this morning and asked me why a forehead is called a forehead.  I tried my best to explain.

I then asked her why a finger was called a finger. 

Well, maybe they put a bunch of random words into a jar and mixed it up like the barrel of surprise and then picked out the word finger.

I followed up with "who's they?"

Ummm...Oh, George Washington!  Or maybe Orockobamma?

The cat started tearing apart the bathroom at this point, so she went to investigate that instead.