One of the latter is "what does faubourg mean". There are many streets called "rue
Wikipedia expalins it well:
Faubourg is an ancient French term approximating "suburb" (now generally termed banlieue). The earliest form is Forsbourg, derived from Latin foris, 'out of', and Vulgur Latin (originally Germanic) burgum, 'town' or 'fortress'. Traditionally, this name was given to an agglomeration forming around a throughway leading outwards from a city gate, and usually took the name of the same thoroughfare within the city.
So that is one mystery solved.