Foucault's Pendulum has a litany of character names that intrigue me. I wonder where many of them come from.
For example, Casaubon, the name of one of the main characters, seems like it comes from Isaac Casaubon, a French philosopher. While I'm having trouble drawing overall thematic connections and links, this has been useful for considering exactly what's going on in the story.
There are a few names, though, that I can't seem to uniquely connect to any specific person or idea. Particularly, the names 'Colonel Ardenti,' 'Diotallevi,' and 'Belbo' remain a little opaque. My guess is that Ardenti just comes from the Italian word "ardenti" itself, but I'm not entirely sure. 'Belbo' looks like it has a lot of possibilities, and I'm somewhat lost as to which one is correct. And I don't get any results at all looking for connections to 'Diotallevi.'
Do the above names relate to any ideas or allude to the real world? What do they refer to?