This movie's psychiatrist played by Donald Pleasance was named Dr Loomis for the shrink in Psycho while the villain was named for the film's European distributor What is it?

The movie you're referring to is "Halloween." In this iconic Horror film, Donald Pleasance plays Dr. Sam Loomis, a nod to the psychiatrist character in Alfred Hitchcock's "Psycho." The villain, Michael Myers, was named after the film's European distributor, which was named Michael Myers Productions. This film, released in 1978, became a landmark in the slasher genre.