What's in a name

One of the things in The Stendhal Syndrome that I don't like is Anna Manni's confusion when she learns that the French guy is named Marie. Now, I know it fits with the general theme of gender confusion that runs through the film, and also allows Dario Argento and Franco Ferrini to make a further allusion to the titular Stendhal, whose real name was Marie-Henri Beyle, but it also seems to forget about Italians like Gian Maria Volontè and Enrico Maria Salerno whose names seem to follow a similar pattern.

Is there a difference between the French and Italian naming conventions here, an attempt at writing something multi-layered that does not quite come off (at least as far as I am concerned) or a generational / regional / other thing? After all, Asia Argento's 'real' first name is Aria, because of the rules of what a child could or could not be named that pertained in 1975.

"Naive yet macabre"

Which artists might Berto Consalvi's "naive yet macabre", "mystical period" paintings in The Bird with the Crystal Plumage perhaps be compared to? Marc Chagall is one that comes to mind, but who else?