If it had been originally in English, the title of the film, Stranger By the Lake, could easily be seen as a double entendre. Anyone who has seen the film would agree that it is, indeed, “stranger” by the lake, an all-male gathering place at which nudity, public sexuality and murder are accepted as commonplace. The other aspect of the double entendre is, of course, a reference to the stranger who is met by the lake, a place in which couples pair off, make love and fall in love with relative anonymity.
But that is if it had been originally in English. In fact, this is a French film, and the translators, presumably with the agreement of the film makers, applied that title to a film with the original title, L’Inconnu du Lac. I know from reading Camus in freshman French that The Stranger is L’Etranger in the original French. L’Inconnu translates literally as “the unknown.” Rather than remove the double entendre, this appears to add further layers of suggestion.