Marion/Melanie/Marnie
When you make 53 movies like Hitchcock did, and make them as an auteur with a vision....there are bound to be patterns that turn up.
Movies with dominating or too-close mothers in them, for instance.
Or people hanging from ledges and rain gutters.
Or names?
Marion. (Psycho)
Melanie (The Birds)
Marnie (Marnie)
Ever notice how "Marnie" is rather a hybrid of....Marion and Melanie?
One wonders to what extent Hitchcock sort of elected to create that juxtaposition.
He could not have had this on his mind in 1959, when he bought Robert Bloch's 1959 novel, Psycho, with its key female character of "Mary Crane."
In Bloch's novel, Mary Crane starts out the story in Dallas, Texas, and drives north to a Bates Motel somewhere in Kansas or Missouri(it is never specified.)
Hitchcock and screenwriter Joseph Stefano moved Mary Crane to Phoenix, Arizona...I believe so as to put Mary closer to California so that Hitchcock could move the Bates Motel to Northern California and film footage in parts of that state with which Hitchcock was familiar.
But a routine fact check revealed that there was a REAL Mary Crane living in Phoenix Arizona, and for legal movie making reasons, the name would have to change.
Hitchcock chose "Marion." Close enough.
And Marion Crane, as portrayed by Janet Leigh, became a very famous movie character. Famous from the get-go in 1960, given that the Psycho movie poster billed Leigh with her character's name: "And Janet Leigh as Marion Crane." Often actors got billing "And" ("And Ernest Borgnine")...its practically required these days to give someone with a "name" noteable billing. But to get the CHARACTER name up there, too? Much more rare, and in the case of Janet Leigh...historic.
The novel "Marnie" came out in 1961. Hitchcock bought the book and contemplated filming Marnie as his next film after Psycho. But he seems to have realized that Marnie -- a romantic drama with sexual and psychological depths -- was still too mundane a property to properly follow Psycho.
So the search continued for "the movie to follow Psycho" -- and maybe, to TOP Psycho. Daphne DuMaurier's The Birds(a short story published years before) got the nod.
The screenplay for The Birds was practically a new, original screenplay. There wasn't enough story in the short story for a full-length film, and Hitchcock had no use for the practically non-existent characters in the story(a stoic farmer and his family.) After a few false starts(including a red herring murder mystery), Hitchcock and his screenwriter Evan Hunter settled on the familiar family psychodrama of a young man too close to his mother(!), and the blonde who invades his territory. The best thing in 'The Birds" is ...the birds, but its tale of a broken family(The Brenners) and the stylish San Francisco woman who comes to stay, well...its there.
Since The Birds script was original, Hitchcock and Evan Hunter could choose their character names. And thus the heroine of The Birds became...Melanie.
One can see the wheels turning in Hitchcock's head. He knew that he would be filming Marnie relatively soon. His last, and most successful movie, starred "Janet Leigh as Marion Crane." Marion. Marnie. Certainly THOSE two names were close enough. Mash them together and you get...Melanie.
Plus three "M" names. Hitchcock had an affinity for "M" names: Marion. Melanie. Marnie. Mitch(Brenner in The Birds.) Mark (Rutland in Marnie.) Michael (Armstrong in Torn Curtain) And even -- for those in the know: Milton(Arbogast in Psycho, though his first name can only be found in the novel.)
And what of the "match ups" among Marion, Melanie, and Marnie? Well, Melanie and Marnie are played by the same woman -- Tippi Hedren -- with only a modicum of difference in the performance -- though Marnie hails from a poor upbringing in the northerly South(Maryland) and is psychologically damaged almost beyond repair, while Melanie is a San Francisco aging debutante with a rich kid's upbringing.
But one can also see a strong connection between Marion and Marnie -- whose names are the closest in spelling, yes? Both Marion and Marnie are working class women -- well, SECRETARIAL class, which is more white collar -- than the rich Melanie. And both Marion and Marnie ultimately steal money from the employers who trust them. With Marion, its a profound "one time crime"(and she intends to give the money back). But with Marnie, its a continual criminal enterprise -- she steals from MANY companies, one after the other, changing her name and look each time.