There was one version called Satan Met a Lady, I guess because Hammett had described Sam Spade on page 1 as looking "rather pleasantly like a blond Satan." The earlier versions didn't follow the novel very well. When John Huston prepared his 1941 version, he stuck closely to the novel, including dialog and casting actors who really resembled the Hammett characters. Peter Lorre's Joel Cairo and Sydney Greenstreet's Caspar Gutman are the living embodiment of Hammet's vision.
Thanks.