There are 3 Narnia films -
The Chronicles of Narnia; The Lion, The Witch and the Wardrobe
(2005)
The Chronicles of Narnia; Prince Caspian (2008)
The Chronicles of Narnia; The Voyage of the Dawn Treader
(2010)
But! There are 7 Books! The Three above and -
The Chronicles of Narnia; The Silver Chair
The Chronicles of Narnia; The Horse and is Boy
The Chronicles of Narnia; The Magicians Nephew
The Chronicles of Narnia; The Last Battle
The Books were written by - C. S. Lewis
Also the four main characters (in the films) are -
Lucy Pevensie - Georgie Henley
Edmund Pevensie - Skandar Keynes
Susan Pevensie - Anna Popplewell
Peter Pevensie - William Moseley