Ghost Dog character inspired by 'Le Samouraï' (1967)
I just finished watching the French film "Le Samouraï" and it's very clear that Jarmusch was inspired by it when he wrote Ghost Dog. There is no doubt about it.
Check it out. http://www.imdb.com/title/tt0062229/
Fortunately, Jarmusch does not "rip off" the story from the French film. Instead he borrows the archetype of the main character and writes an original story to go along with it.