Funnily enough I was just coming to post that - I actually found the book it appears in.
It's a sort of Who's Who of Algeria in 1848, and mentions Cailly as well as Giacobbi. As the address is right, it's clearly François:
https://archive.org/stream/lalgrieen...e/240/mode/2up
https://archive.org/stream/lalgrieen...e/270/mode/2up