How many Psycho movies were made?

The Alfred Hichcock movie "Psycho" had three direct sequels: Psycho II, Psycho III, and Psycho IV: The Beginning
(technically Psycho IV was a prequel)

There was also a (rather inferior) 1998 remake of the original Psycho.

There is also a Hindi language movie called "Psycho" which is a completely unrelated story.