It's "Naruto". Not "Nartuo". N-A-R-U-T-O. Naruto. This was noticed earlier this week by Rich at IGN, and as far as embarrassing box art misspellings go, "Nartuo" tops Resident Evil:
Someone at Namco Bandai had one job to do! Only one! At least they got "Shippuden" right. And "Powerful", for that matter.