*Spoilers* From the Naruto Manga (The Japanese comic book Naruto is based on)
Arashi Kazeme
Arashi Kazame who later became known as Yondaime Hokage. (Yondaime is the Japanese word for fourth.) Now so far this would mean that because they don't have the same last name, Arashi could not be Naruto's father. However Arashi did not marry Naruto's mother (His mother is not yet revealed in the manga) and such Naruto kept his mother's maiden name. The fourth Hokage was trained by Jiraiya (why Jiraiya takes Naruto under his wing) Jiraiya was trained by the third Hokage. Naruto's mother died shortly after he was born, Arashi blamed the village for her death (reason is unknown) faked his death during the encounter with the nine tailed demon fox (which he sealed into his son Naruto) Later he founded Akatsuki. Some members are Rin, Uchiha Obito, Uchiha Itachi, and Orochimaru. (None of the others are significant, atleast until Naruto Shippuuden when the Akatsuki capture and kill Gara extracting the demon sealed in him.)
Notice from rvalkass:
Copied from http://en.wikipedia.org/wiki/Kakashi_Hatake
